Absolutely the opposite. Using Apple's built in one is less secure because it is within the ecosystem that you are subject to; if you are locked out of said eco

Absolutely the opposite. Using Apple's built in one is less secure because it is within the ecosystem that you are subject to; if you are locked out of said ecosystem, you are locked out of everything. Password managers should never ever be inside your ecosystem. That is why people often manage the database syncing themselves and relying on the database own strength, eg kdbx.