This is actually not bad.
Hear me out.
I’ve read a lot, like a lot. Over time, I avoided reading these types of works because it gets typical.
So in comparison, it’s relatively decent.
And I have a high standard when it comes to looking for a manga to read. Or maybe I’m just picky, who knows. My rule of thumb is to read works with above 8.3 ratings. (Not counting CN or KR or yuri/bl, these have high ratings with shit stories for some reason)
On the contrary of what another reader commented, the MC actually does protect his friends and has let his powers slipped in doing so. Idk why bruh was yapping contradictions. The MC was not a, “spineless coward.” Do people just ramble without understanding the meaning of what they said?
Anyways, just as someone has stated too, they could also simply add on some mechanics as if their mindset stays the same except for the experience.
Or explain that long living beings take more time to change, which is generally scientifically true. (I’m in favour of this if they want a quick fix.) This can easily excuse relatively stunted emotional development.
The relationship between the mc and his girl could have definitely been written better. Such as the fact that they could have definitely developed past awkward flustered moments with that much time.
However, this could easily be fixed if they made it explained that the current relationship is actually recent, considering the thousands of years of training before recently being sent to the current world.
Perhaps with a mix of the explainable slowed emotional development of a long living being.
Ngl, people may be put off by long living characters, “not acting their age,” but tbh it can ironically be argued for the same reason and justifiable. Long living being takes longer time to change.
Literally an easy explanation. I’m wondering if they ever thought of it.
Because of course, it’s the typical flustered teen virgin male character.
Yeah, lots of "could"s and "if"s, you basically just guess a whole lot of nonsense and none of it changes what the author actually wrote, which is what we're actually scrutinizing. Also, some of your "explanations" don't even make any sense.
What's scientifically true about long living beings taking longer to change? The only long living beings that exist are some animals and trees. In the first place, we're talking about mental maturity and emotion, which you can't measure in any of the aforementioned beings, hence why the topic is about humans, which are not long living beings. The fact that the mc is a human and not a naturally long living being already makes your statement irrelevant.
Also, popping in at the very last second when things are at their utmost breaking point isn't protecting your friends. Letting your friends get severely hurt, brutally bullied and defeated by people with bad intentions isn't protecting them. Allowing them to be taken away to some unknown location and confined by people with evil schemes isn't protecting them.
Or is it all good as long as they're technically alive? What about in the recent chapter where one of them was held hostage so that the other was forced to swallow some drug made from the lives of other innocent people? I guess it's all okay since he'll "save" them eventually right?
But that's totally convenient since the author would never actually have one of the main characters die. But in a real scenario it doesn't work like that. In a real scenario the villain doesn't stall and wait for the mc to show up at the very last moment. In a real scenario all of the mc's friends would already be dead as he takes his sweet time over multiple chapters to find and rescue them.
Yes he is a complete and total spineless coward because after 30 thousand years of training with the strongest being that destroyed countless world, he most definitely has the power to prevent all of the bad things happening to his companions. But he refuses to because of reasons that don't even make sense and are completely contradictory to his goals.
He's so obsessed with living a "peaceful and quiet life" or whatever yet him acting like a pussy all the time is exactly what's attracting so much negative attention his way. He just randomly assumes, with zero basis, that him proving that he's strong will somehow cause everybody to realize that Felize is the demon lord and the whole world will riot as a result. Even though countless other students are allowed to be strong for seemingly no reason, even though they couldn't decipher her identity or even detect her nature as a demon lord as she's just waltzing around in the middle of their facility in cat form, even though they clearly have no way to actually confirm what goes on in the worlds that they all return from. There's literally not a single logical reason for him to be so weary yet he still acts like a useless brick at all times even though he has enough power to protect Felize even if she gets found out for some unexplainable reason.
Lastly, bragging about your standards is pretty cringe, especially if your "standards" mostly just amount to reading whatever is rated the highest. The fact that you even rate this trash story so well despite it's innumerable glaring flaws and plot holes is telling enough. There are plenty decent stories out there that aren't rated as high as some that are worse, you miss out on a lot when you only tend to try what the masses seem to enjoy, you sound like one of those people who think that Solo Leveling is the peak of the "Dungeons on Earth" genre when there are many better ones that came before and after it that just simply get a mainstream anime adaptation.
Anyway, all that to say that the mc is indeed a spineless, cowardly pussy of an individual, just like so many other Japanese main characters, and the story is dogshit for many reasons other than just that. I've seen many cases where an overpowered main character was allowed to be overpowered yet the story itself was still interesting and engaging enough so that things didn't become stale because of it. This whole "hide my powers no matter what" trope has long harshly fallen out of style for good reason and if the author can't make a compelling story with an overpowered mc without making use of this terrible and frustrating trope then that just speaks to their lack of ability, that and the aforementioned glaring plot holes and cliches.