I can't help but think the obsession with download size of script files in the JavaScript community is a bizarre premature optimization. I'm saving 400 kb by dropping useful library XYZ. Meanwhile, the page is loading 47 different snippets of non-async advertising and tracking code, social media buttons, non-optimized full-size PNG images, auto-playing videos, and more useless resources that dwarf any amount of JavaScript code.
I think that's a bit of a non-sequitur. Many people are focusing on performance in more areas than just dropping "useful" libraries - moving to async ads and tracking (if they have any), optimizing images, using SVG, etc.
Besides, 400k of (blocking) JavaScript can be the difference between the site loading quickly on mobile and the user giving up.