[BoorishBears]

That does not track with anything I've ever seen out of using Supabase

If you target Postgres, just about any Postgres instance works the moment you enter a connection URL.

You can hop from one managed Postgres offering to another in 10 minutes and lose no functionality. Everything from auth to programming (and even RLS implemented in the query space) will work instantly: no additional software needed.

Are you claiming that's the case with Supabase and its JWT auth/RLS entanglement?