No, I don’t think so. I still think that it requires a different phone number on each phone. But I agree with you that it is annoying that they do not allow it, especially since they could simply imitate the functionality that exists on the desktop apps.
I agree. Especially since tons of password managers exist on the market and in many forms. I would rather prefer that they improve Proton Drive and Proton Calendar, that are to me much more complementary to Proton Mail.