Your #1 is what's wrong with a lot of these broken "frameworks" like Failwind, where they have PX metric widths and media queries whilst using EM/REM fonts.

Also a problem when people do MIND-NUMBINGLY DUMBASS GARBAGE like declaring fixed widths and heights on interface elements.

All of your points aren't just valid, they're the top problems that so many developers out there right now say "don't matter" or "screw the users it effects". It's disgusting the narcissistic sociopathy we're seeing amongst artists under the DELUSION that they're "web designers" and front end coders looking for every sleazy predatory dirtbag shortcut (framework) to avoid having to actually do a professional job.