This is very upsetting to me–more as a point of principle than in fact–but I appreciate that it doesn’t bother younger generations at all.
I am in a support group with over 100 senior citizens in it. Getting a file with a *.rtf extension used to be a thing, but it hasn’t been a thing in years. I do get *.doc and *.docx files so they’re probably getting lured into Office like you said even before Wordpad is removed.