That's actually something that irks the shit out of me as well. For at least eight months when I started using Nostr, despite already running a lightning node, I did not set up zapping. And the pushyness of people to get none Bitcoiners into using it probably drives away a large amount of people.
But whatever, I do also understand that this is a protocol built mainly by Bitcoiners. So I don't think that's going to go away anytime soon.