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5) is the only valid reason, the rest has comparable alternative shitty things when using whatever framework

No amount of discipline was going to make medium-large websites maintainable back then. Today it's actually possible if the creators know what they're doing. Tooling isn't going to prevent people from doing stupid things.

Also: using JS for things where HTML and CSS would have been sufficient, creating some of the issues above.

this ^ - and if js at all, then only using a subset which passes jslint.com without any errors or warnings. that the score of any site should be

100 100 100 100 1.1s max paint (mobile) 0ms block 0.0xx max shift A+ headers 0 errors and 0 contrast errors webaim goes without saying of course

I agree with HTML+CSS+JS websites being not fine. But to be honest, js callbacks are more of a language thing than a framework thing. You don't need to use frameworks to write promises.