One consideration is that Bitwarden seems to not work fully in an offline state the same way your setup would. I constantly try to edit or add a password while offline and can't.
I think this somewhat negates the collision situation though.
That came up during my research and it's one of the reasons I couldn't choose it.
Forcing a read/write right before and after each edit probably simplifies the sync scenario for them but I don't like relying on permanent internet access in my life since it's just not the case.
