komorebi dev here - Jwno is awesome and I highly recommend people give it a try (especially people who enjoy writing Lisp!)
The Windows tiling window manager development scene is a very kind, relaxed and collaborative space where we all take inspiration from and support each other
That is amazing and I hope it'll continue to be so :).
The Linux scene isn't bad either (or at least it wasn't 4+ years ago when I was into this); I've used StumpWM as a daily driver for many years, and while it was definitely niche, I still saw friendly exchange of ideas and experiences with people using and/or contributing to dwm, i3, and ratpoison.
(Then there's EXWM, but I never really mustered the courage necessary to try it.)