What? Me Worry!!?? ;)
Oh please do write up and share git subtree. There was a plugin announced just the oher day that uses git for updating plugins, I thought.
Point releases (you call 'patch releases) ... like from 3.1.8 to 3.1.9 ... since it's LTS and now only getting security fixes are PDQ so hardly any 'downtime' ... not enough to make announcements, schedule a maintenance window with whomever, etc.. ... of course, that depends upon entity and 'clients/customers' and how demanding they are, I guess.
Ever read the fine print on how providers hardly ever get 'caught' with NOT providing '99.9% uptime'? ;)
'spirit of sharing', Ken