Schema Only ID (No authentication)

Currently when we create a new schema ID we create a random password, expire it and lock the ID. This is to guarantee that nobody from the application side will be able to login to the database as a schema ID and thus nobody will accidentally be able to drop application tables or drop columns or add new columns

I am considering using schema only IDs. As I understand these IDs won't have a password so there will be even less risk that someone will unlock these IDs and login to the database. And if there is a real need, these IDs can be altered to become db authenticated.