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RLS is rock solid. That's what Supabase leverages to create access policies and more. They have a very good example of how it works and how powerful it is in their docs: https://supabase.com/docs/guides/database/postgres/row-level...

Last I looked (several versions ago) RLS for `UPDATE`s was not great. Checking now... I see the same problem remains for `UPDATE`s, that you can't see old and new values for the affected row in the policy code. The workaround, when you need to see the old and new values, is to use a `TRIGGER`.

Not an expert but my impression is that RLS is not only rock solid, but extremely more testable since you can construct sql queries that test virtually any access scenario

You don't have to use RLS. You can do permissioning in VIEWs and TRIGGERs.