You're assuming that font size increases in a browser are part of assistive technology and they are not. Relative font sizes are much more adaptable across a broad range of devices and technologies.
I gave this a test a few months back on some 40 popular websites and found only a few using relative units, and several had severe visual issues from changed base font sizes.
Browser zoom scaling seems to be the “much more adaptable” solution to me.
There are standard committees you can join if you want to share your opinion on how disabled people should be increasing their font size and having components run off page.
I think your sarcasm may have clouded the point you’re making :) I’m not sure what you’re getting at. Browser zoom generally does a much better job at overflow than font size scaling.
Browser zoom scaling seems to be the “much more adaptable” solution to me.