As a superuser administrator, I need to be able to see ALL tables in ALL schemas when running "\dt", not just the ones in "$user" and public. And I need it to act consistently across all the systems.
\dt *.*
But I am skeptical how often you really want this in a real database with more than a few tables. Surely \dn+ followed by \dt [schemaname].* for a few strategically chosen [schemaname] would be more useful?