Good point I guess it's not quite required as of yet and I'd advise against our users installing it on our W7 machines as they're old and hopefully will eventually all be replaced within the next 3-6 months(very slow deployment process here) , however autodiscover no longer works on Proplus on both W7 and W10 devices(no more local exchange servers) ADSI points to
outlook.com* and because they can't be arsed to fix the autodiscover to point to the cloud directly still tries to contact local CAS1.mydomain. , so the only real need for O365 is the direct connection if a profile were to become corrupt and if Azure somehow prevent connectivity on office proplus in the next 6 months. I'll advise them on the required installation concept they even rolled out LAPS as an available install lol, LAPS as you likely know is something that changes a local admin password to a unique one. I'm also trying to work on a solution that can fix local config manager clients.