I couldn't agree more. I use Google's password manager because (1) it syncs everything (2) I already use Chrome everywhere (3) I can't be arsed to set up another password manager that is generally inferior in terms of integration.
I don't care for the FOSS argument. I just want stuff to work and work easily.
Plus, I sincerely believe Google is 'too big to fail'. If somehow Google gets hacked and my plain text passwords all get leaked, it means something huge has happened and we're all massively screwed anyway. So, whatever.