You do have a valid point, but the strongest team needs strong individuals that would be able to go toe-to-toe with a single villain if for any reason members of that team were put of commission. Like the team that got blasted by AfO. In a highly specialized team, the instant one individual goes down, the teams fighting power goes down significantly. If a villain proves too much to handle by one's self then a team is a good fall back plan, but in a world where a villain won't play fair, its better to make sure everyone can make it on their own first before only relying on other's powers to make themselves useful.
Besides being a hero is a career and a popularity contest, which means one hero wants to be better recognized than his/her peers. Only recently as seen in the chap that introduced Hawk, pro teams are being set up (like with giant girl, kamui woods, paper ninja Edge, and Jeans (??)). Even though miss gigantess KSed Kamui, they are putting aside their individual differences to work together to be stronger as a group.
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Since quirks aren't magic powers, but bodily function, over exerting oneself could lead to death or perm damage. These super power creeps you speak of always end with some crippling damage done to the person. Each time All Might went beyond his body's comfortable limit, he became less able to sustain his muscles form or draw in strength. Endeavor could possibly overheat and kill himself is he over uses his power. It like certain levels of strength have neglible recoil, and going above that equates recoil that could kill a person. Like if i try to lift above my weight limit, i risk rupturing my blood vessels.
Deku usually uses some percentage around 10, but when his back hits the rope, he goes to the 100% that will cripple him.
In the training arc, Deku used 100% of his strength (the name 1000000000% was a bluff), however he used 100% strength on 2 moves a Detroit and Delaware smash (plus he was on an adrenaline rush which is known to increase an individuals base strength tenfold). A little iffy yes, but not inconceivable considering Deku used 100% multiple times against Shoto at the school comp (limited to his fingers and one arm).
In the Eri arc, he simply was being reversed to a state before the body breaking but he in no way received a power spike, he simply was using his "forbidden" final form while a mage spammed heal the entire time.
Deku never fights at full power for obvious reasons, so when he is at the "last" of his strength, he has no choice but to go into crippling mode.
Um 1 thing, Naruto was basically building up to a "team" defeating their final boss, however, as a person who only watched the anime, I think that Naruto and Sasuke were both given many many "buffs" and in the end it was an individual fight against each other.
And also literally Naruto uses up all his chara and energy in his death fights and somehow always has more in reserve, possible Kurama but he doesn't got control over till the last few hundred episodes...
With the society in BNHA, All Might was looked upon as the Symbol of Peace, someone who will be there to save everyone and yada yada yada. As a human he couldn't save everyone, but he has defeated a significant amount of enemies by himself (mostly maybe because if he had partners they may be destroyed). He does work with the government/leaders of the Heroes against All for One, I dunno if you can call that soemhwat teamwork
is why horikoshi or why the hero society in general relies solely upon ONE hero to defeat villains? for example, whether it's all might or endeavor, the major battles always focus on some one-to-one combat. but i feel like what makes the most amount of sense, and like how a lot other superhero universes work, is focusing on having the best TEAM out there?
like why do people think just one person, all might, could defeat someone like all for one who's working with a million different quirks? it makes way more sense to find several different heroes, who each have their own special skill, to team up and try to take the major villain down - especially if all might's particular power, strength, does him no good against someone who has indestructible armor (like a nomu).
i really hope horikoshi focuses more on team building, rather than continue these battle line arcs of "1000000% MORE STRENGTH" because honestly, it gets boring when every time you think deku or all might or endeavor has reached the last of their strength, they just somehow get stronger and that's how they defeat the enemy? it really ruins the surprise and excitement.
i think that's what i loved about naruto is that because it was mainly teams vs teams, there's a LOT more strategy.
of course, i still love bnha and i especially love the battles where everyone works together as a team - it makes my heart literally glow with pride lol. this arc especially got me feeling some kind of way :')
thoughts?