how on earth is this gatekeeping? GP said nothing like "imperative programming isn't true programming and deserves to be looked down upon" or w/e, they just expressed a personal preference for FP. ("I hope functional programming languages become popular and also used for systems programming.")
"Still", as if non-pure functional languages are not worth it or "bad", even if just depending on a project that uses them.
Sorry, but that gatekeeping attitude among functional languages proponents is very tiring.