Ngl i think I'd prefer just entering a password once manually over Google doing some magic bullshit to make it work across devides.

I really do like the concept in contrast to some other comments here. I think improved integration can be a path to a better user experience. However, I have doubts Google has the skills to bring it home and actually make it work correctly every time and across numerous devices. A project like these takes something Google doesn't seem to have: commitment.

I see this more as an idea that will come broken on delivery and then removed in the following major release. I'd like to be proven wrong. Really and truly.