Tomura legit is a dumb-ass though, there are several great tactics that could have won him the entire war.
Dumbass isn’t the right word for it. He’s a child lashing out emotionally, of course he’s not thinking the most tactically in this moment.
1 - What he should have been doing is flying the opposite way and landing only to use decay city to city.
Not only does this force an exhausted Deku to chase tomura, exhausting him further, but also wipes out Japan all in one tactic.
I think this forgets that Shigaraki wanted Deku to see that he was wrong. That the little kid inside him had died and became Tomura, the symbol of destruction. It’s like arguing why doesn’t Endeavour use Plus Ultra: Prominence Burn to destroy the Nomu whilst in the city, he’s a hero so endangering civilians not an option for him much like how leaving hope in Deku isn’t an option for Shigaraki. This strategy also doesn’t account for Deku using black-chain and stopping the decay before it really begins. The Mt Fuji strat at least would have destroyed a large portion of the country by itself, and massively demoralised Deku (who probably can’t stop a volcanic eruption with black chain like he can decay, given it wouldn’t stop the explosion from happening or the lava from running).
2 - Force the fight into space. He can survive in a vacuum, Deku can't plus it makes Gearshift useless and the hypoxia even worse.
Space has other effects other than merely being a vacuum. We don’t know how solar radiation would affect his body. It also, to Shigaraki at least, makes the fight feel less personal if Deku doesn’t live to see him destroy everything. This also assumes Deku would let this happen. Like he could try to knock Deku towards space, but a Quirk like Gearshift or Float could probably stop Deku before he reaches the edge of the atmosphere.
3 - He should have all the quirks seen in Omni factor unleash during the final punch. He has tentacles that could counter black whip the whole time. He had a myriad of ranged attacks. But he doesn't use any of them.
He was beating Deku without them so I guess he didn’t feel the need to use them. The tentacles are also kinda featless, I mean we see Mineta restrain one in the anime and even in the manga a worn out Mina, Kirishima and Fatgum can al hold them back, so there’s no reason to believe that Blackwhip (which scales way higher than these guys) wouldn’t instantly destroy them. His impure beam also seems to be heavily telegraphed, which isn’t very effective in a fight against an opponent close to you in speed.
Using search to target and spaming Impure beam from Orbit would legit cheese Deku.
That takes the personal feel out of the fight though, which Tomura doesn’t want. He wants Deku to see him for the villain he supposedly is (maybe he also wants to prove to himself that he is a villain). That doesn’t work if Deku doesn’t see his destruction first-hand. He also likely wants to destroy everything with decay, as he feels that is his only purpose (“otherwise, what’s the point of these hands”). It’s not that he’s dumb, it’s that he wants to prove something to himself/Deku which causes him to fight less intelligently, and more emotionally.
This much is true, but still odd.
AFO has several strength enhancers which augment physical appearance and Shigaraki uses non of those, ever.
If he’s using strength enhancers I’d expect to see, or have an implication of some being used. There’s really nothing.
It’s hard to believe they’re using strength enhancers of any sort.
I mean, weren’t Shigaraki and Deku stuck in a deadlock for a period of time? Why didn’t Shigaraki just pop out this shit.
I think All For One must have lost the quirk against All Might. We know the first fight made him lose quirks, so it would stand to reason that he lost some in the second one. Especially since AFO never uses this quirk again either, despite nearly losing against Endeavour. And maybe he got rid of them before he gave the quirk to Shigaraki, seeing how they didn’t really help against All Might. We know that he can get rid of quirks if he feels like it, he did it with New Order and I think that one horn guys quirk in one of the flashbacks.