If the MC already has the ability to erase his existence and make people forget about him, I wouldn't be surprised if no non-hermit knew what a hermit can do. Not because they haven't been told before, but because hermits can make them forget all about it afterwards.
Some sages lead a nation to greatness by spouting wisdom to a lucky few from behind the scenes.
That assumes they all have the same abilities. It could easily be that hermits, being a non-standard class, have a variety that makes then sneaky, yet not all share the ability to manipulate the persistence of their existence.
Same, I'm not really into martyr complex types either. Imagine if the misunderstanding never got resolved: the kid's gonna end up with severe trust issues after being 'backstabbed' by his trusted and beloved sister, and might've even gotten both of them killed during the succession war. Though this MC seems to have a good head on his shoulders, so I also expected him to have figured it out asap.
Garbage, even if their summary was accurate. These kinds of videos tend to be, at the very least, 5 minutes long (and I'm being VERY generous here), and I could've used that time to read 1-3 chapters myself and decide if I want to keep reading or not. If I come across these sorts of videos, I just scroll down to the comments section since the comments can give you a better and faster first impression.
