If you try to make a website of significant complexity, you’ll find yourself either using a framework, or slowly making one of your own unintentionally.

I know. However, this is not really talking about those complex webapps, but rather about informational or mostly text websites that are absurdly heavy and bloated nowadays. The usual example is cooking recipes websites - the content here is mostly just text and images, yet they pull all sort of extra elements, fancy scripts, not-so-fancy-but-actually-harmful scripts and so on. This is needless.¹ Other great examples are news websites, which are infamous for being stupidly slow.

This isn’t (just) about minimalism, not having many animations, etc. I think those are great in some contexts, but I’m mostly fine with them anywhere if they are used properly. I’d say the real issue here are illiteracy/incompetence when making a website (not compressing images, fonts, etc), the pointless scripts that are harmful to the users and the impact this has on people with worse connections than us.
Let’s not forget that us, developers, tend to have better equipment than the average user, and thus are more prone to not noticing the effects that inefficient software has on the final users.

¹ So much so, that you see initiatives such as based.cooking which, of course take extreme positions, but show perfectly well how bloated the usual places are.