Because realism isn't part of this story so it's absence is irrelevant and not a problem.
she just cheats for a cop out win against fuwa.
That has nothing to do with realism.
this is narratively unsatisfying as well and the reason for that.
It's not supposed to be narratively satisfying, it's supposed to be a justification for why the MC sticks with her and in-universe, it's the FemMC getting jealous her friend is paying attention to someone else instead of listening to her.
But you said the opposite earlier.
No, we literally don't see what happened inside the car
Yes, we do. We literally see she threw the guy out window.
we don't know how long it lasted, how far they went
Yes, we do, we know they crashed right after she threw the guy since he's right there on the ground, it lasted 3 panels.
There's absolutely no ambiguity at all. None. It literally can't be clearer, you're just in super deep denial right now.
that makes the car crashing incredible,
The car crashing is credible because she's just that strong and the entire manga is super clear about it, just like with the MMA guy.
My point was about trained people against untrained people.
Your point is wrong. Trained vs Untrained doesn't mean shit when the 'untrained' fights for real in the streets for money as his job.
You firstly said that 3-4 guys would put an MMA athlete in coma
Which they would.
showed you there's evidence this is not true,
You didn't, you showed two exemples where some guy starting throwing punches by surprise from an advantageous position against people who were neither ready nor willing to actually fight. Show me a group surrounding someone to beat them up being defeated by the guy they surrounded and maybe it'll be closer to what we're talking about since you clearly can't find a single exemple of someone beating a group attacking them from behind.
so they didn't "attack" her from behind
Yes, they did.
No, not right, in the slighest, in any way, shape or form in any universe. I have no idea how you even slightly thought this was a coherent thought.
Three guys jumping you from behind IS an attack and IS violence. Try escaping from 3 different holds at once, see if it's not violence.
but the least I would expect would be for her to suffer against the fight against the athlete not only physically but mentally
You expect wrong. There's absolutely nothing in the manga that even slightly hinted at that being a thing you should expect, it did the EXACT opposite.
If we go by powerscalling, the athlete should not only have the physical advantage, but also more knowledge than her towards violence since he's older than her.
Literally at no point in the manga is any of that established or hinted and the manga actually establish and hint at the exact opposite. You have literally made up a bunch of stuff about both characters that the manga simply does not support.
And no, by powerscailing, she curbstomp his shit because that's what she just did as her feat in the manga, in addition to her feat of denting the door of a car while restrained and no selling a car crash. Powerscailing goes by feats and nothing else, not by 'well, he's a MMA champion so he ought to blablabla', either he's shown he can do something or he didn't.
If anything, even that first punch that should've knocked her out in reality would be a light one.
Again, you're basing that on absolutely nothing actually present in the manga.
let’s just hope the manga will just get better from here on
I hope the manga continues as is without a single change.