You need to provide actual feats, on... basically all of this, actually. Obviously he knows the ins and outs of himself but how does his strategizing allow him to overcome someone who can cover the field in explosives on a whim and overpower someone who is and remains stronger than him in a drawn out conflict? His flames also just don't have feats besides overcoming his own resilience, Teostra is more than capable of harming hunters that are fully immune to being lit on fire and even standing on full blown lava with it's fire and especially it's explosions, both of which it's basically impervious to.
Both of these are just factually incorrect. The explosions go off the moment anything procs them- and this can be as small as them
clicking their fangs together, or a hunter inflicted with blastblight stepping onto Lava, so he's not dodging if the scales are on him, much less if he's using his flames to do so. Teostra also isn't a completely melee fighter, their fire breath and especially the range his scales can spread certainly extend past that.
Again, Teostra's heat resistance is just higher by all accounts, and they can keep going despite being constantly attacked by Hunters and using it's abilities. Come to think of it, Teostra even goes as far to become stronger as it's allowed to heat up, indicated by it steadily glowing brighter with sheer heat until it coalesces into a
massive explosion. Granted, the clip itself is a demonstration of it being pretty easy to dodge that specific attack, but it's a clear demonstration of what I'm getting at.
Shigaraki absolutely has windup; any biomechanical creature does by virtue of needing to move their limbs. Teostra's not really special in that regard outside of game mechanics (which, funnily enough, are straight up absent in earlier entries when it can just charge or smack you with no warning).
Deku also just isn't skilled outside of lip service, his big fights against truly dangerous opponents are won by putting an apt amount of force via One For All. Muscular, Shigaraki, Overhaul even goes as far as to call him out for being predictable when he tries to use 20% for a single directional attack until he gets taken down by the Eri backpack letting him use 100% without consequence.
It's an old page, but I can confirm that Elder Dragons just don't tire like other monsters do in game, so it should count. (not to mention Hunts in general being based on the concept of persistence hunting, where the monster will try to run but just get chased down over the course of in game hours)