Uh, i think you need to read again what i wrote as i explicitly write that there are more issues than just cosmetic things and accessibility is one of these - i just brought simple examples that anyone can test by themselves right now.

But also yes, not every program has to care about these, including accessibility. An image editor or a level editor for some game or some internal and/or throwaway tool that has a very explicit "audience" has no reason to bother about these.