I suppose a nice compromise here would be to make an intelligent decision whether to bring up a prompt asking if you want to change the font size. For instance, if the FaceID detects that your face is farther or closer from the screen than normal, or that you're squinting.
Maybe, but I can say without reservation that the times I find my personal technologies the most frustrating are when they're "trying to help me". 99% of the time, this is the WRONG thing to do - for instance if my phone "helpfully" resizes my text, then there's a very good chance that I can no longer see everything I was trying to see on the tiny screen in the first place, as it will have reflowed off-screen! FAIL!
It MAY be OK to ASK if I want help, but just jumping in and doing something is most likely to result in, "Shut up and do what I tell you!" (in the words of Beka Valentine...)
