What does "hot and in-demand" even mean, exactly? All I'm saying is that based on my (admittedly limited and vague) dataset there seem to be plenty of companies happily running on Ruby (some with Rails, some without) and that "FAANG-type companies we all heard of aren't using it that much any more" doesn't actually mean all that much.

I'm not really sure what your point about senior/junior devs or "roles are not being filled" is.

(aside: please don't delete your post and post exactly the same identical post again to clear the downvotes on it).