Unfortunately nothing like the old school CFI forums exist anymore. The other science-based forums that have been around for a long time seem to have become places for cranky nerds to discuss their hobbies.
At any rate forums have pretty much been made redundant by social media, the closest thing still going strong is reddit — which is mostly shitposting. Twitter has some interesting commentators but you can’t really have discussions with that format.
The world has moved on, but what else is new.