I understand, but right now PostgreSQL doesn't provide simple way to protect columns insertion/updates, at least, nothing as simple as RLS
So either Supabase should work to improve Postgre in this way, or work toward some extension of PostgreSQL
Right now, complex things like security definers or triggers (which aren't documented at all in Supabase's doc) are necessary to protect fields to be selected or updated
Having something simpler feels very important to provide an easy to use platform