4. a citation why chrome would be "safer" than firefox (or edge) would be appreciated. in terms of privacy, i wouldn't trust chrome as much as i'd trust firefox.
7 and 10: as others have noted, where is the security risk in storing the encrypted vault in the cloud? actually, choosing user-friendly solutions has a security benefit in itself because it doesn't make you switch to less secure alternatives ("i'll just use my standard password for this one thing) out of laziness
9. should mention PGP, although that's certianly not convenient and might not work for less tech-savvy people.