Totally agree with you. The only one that would make sense to improve readability is the numbers separators.
Mostly the idea was that you can do these things in JS, not that one should do them :)
hello! Thanks for your comment! for me it was useful. did not go one by one, but was useful to point some JS we were not using, and from that, we were able to branch out and remove all the unused parts. For CSS was also usable because we had prefixes (bem style) and after we had one lead we could remove multiple parts.