dependency_for is going to make type annotations difficult and is also as we see in #4656 they break type annotations also. As we see in https://gerrit.sqlalchemy.org/#/c/sqlalchemy/sqlalchemy/+/1244/ we can go back to using cross-module assignment, let's see if this is feasible. I remember that there might have been some situations where nothing except dependency_for() worked, but let's give it another try.