I understand their announcement says app passwords will stay (for now). But should Google eventually also deprecate app passwords, it would really restrict the

I understand their announcement says app passwords will stay (for now). But should Google eventually also deprecate app passwords, it would really restrict the use of third-party clients with GMail, given the self-paid security assessment OAuth clients must undergo. It would be a sad development given that email is one of the last popular "open messaging protocols" in use, where one can choose what client to use.