“”Using all caps is a sign of mental slowness.””
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Actually... people, usually older people, that are not computer-savvy and have bad vision, often use all caps because it’s easier for them to read. In a perfect world, somebody would show them how to increase the size of the text instead... but some folks don’t have that kind of help available to them.
Most folks already know this, since it is just common sense. But perhaps not knowing or not having common sense is a real “sign of mental slowness”
I am old and I have bad eyesight and I can manage without all caps, then so can they.