Google is shutting down Google+ but as I see it there is so much wrong with what google is up to that I’ve stopped caring and starting the move to a new platform. I’ve moved from:
Google Home to Amazon Echo
Google Play Music to Amazon Music Unlimited
Google Cloud Computing to Digital Ocean and on-prem VMware
I could very easily move from GMail to Office365 but the one thing I hate worse than Google is Microsoft.
My desktop is exclusively ChromeOS but I can go anywhere including Firefox. As for the host OS it really does not matter any more. I think a proper AndroidOne tablet is a valid choice.