Or,are we just getting older and these things suddenly matter?
A button looking like a button isn't an age (of the reader) thing.
Possibly a factor, but I also think these issues are becoming much more widespread, leaving us less able to tolerate them than when they were less common.
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Nah, one of the things I found in Discord's accessibility settings is an ability to turn off or reduce animations and other visual effects by default, which is wonderful no matter your ability.