Maybe you’ll convince me (haven’t read your article yet) but I’m GUILTY. A habit my sons are always berating me for. However, I do find it makes written text more readable by putting more space between sentences. If submitting a written piece, I have to work extra hard not to do it (and Medium actually prevents it). I realize it isn’t officially sanctioned but I will always like reading with 2 spaces after a period BETTER. I didn’t know that others do it too !!