Agree with most of your points, except for the fact that GSuite provides way more than file sharing. The true comparison would be between Google Drive and Dropbox, where Dropbox is difinitely better.
Oh I meant the 365/Dropbox combo, probably should've been more clear.
I never thought I'd write excitedly about this, and was super sceptical at first, but honestly, it's great. GSuite feels like a toy at this point.