Probably biased, but with all due respect, as someone who has admittedly read the Bleach manga several times, it doesn't feel right to list it with a bunch of these other series, mostly because it actually does write multi-dimensional characters imo. But this is coming from me, whose favorite arc of the series is the one with the least focus on fighting and more of a manifestation of the worst thoughts I have due to anxiety and being SUPER character-focused. I will not deny that Ichigo isn't OP. He is due to being a mixed strawberry-flavored cocktail of every type of thing introduced in the series, but at the same time, he does have internal conflicts related to his mother's death. Also, his motivation is less about saving the world and more about being able to protect those he cares about. Plus, this is also the same series where the one main villain becomes immortal and has to be sealed away (NOT by Ichigo mind you) because he can't die.
Also, I'm pretty sure Luffy's motivation is not saving the world but to become King of the Pirates. Literally one of his most famous quotes is "Ore ga kaizoku ou ne naru!".
I'm not going to deny that what you said applies to Naruto because that series did go downhill pretty quickly.
I'm sorry if I come off a bit mean, that isn't my intention, but at the same time what you said feels a bit like a gross oversimplification from someone who never actually read any of the series mentioned.
I will not deny, there ARE definitely shonen series that are exactly what you're describing, but it just kind of feels off to me to write off everything as that.
The 'filler' season of Full Metal Panic was the best one.
If you're talking about Fumoffu, yes. Fumoffu is wonderful and more people need to experience it and the wonders of Bonta-kun.
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Alright, now for an actual hot take I have. Gintama is better as a battle series than an actual comedy. When it's funny, it is extremely funny, but when it's at its worst, it drags on whatever joke it's telling for way too long to the point where it's no longer funny and I just want to yell "ALRIGHT, I GET IT, CAN WE JUST MOVE ON ALREADY!?"