I've been using https://kagifeedback.org for a couple months now which is a Flarum instance and OH WOW is it amazing.
A large part of it is of course because of the Kagi team who are on top of things on their instance. Properly help tag everything and such.
But still, it's such a great platform to provide feedback on and keep track of feature requests!
Props to everyone who's worked on flarum!