With 1Password 8, not really. it's destined to people who just want sync to work automatically. It's more of a "convenient" solution.
I was a 1Password user back in 2011 and switched over to a bit of Lastpass (short lived) and then Keepass with LAN sync when 1Password 6 and the early signs of 1Password going subscription model showed. I was against it back then. Nowadays I just want to progressively stop fiddling with things and I hate the cloud less too I guess.
You could log into a membership account then block the desktop app from connecting to the web and add items to your vault after that but that would be very cumbersome as you probably wouldn't be notified about updates and so on. Sync can't really be deactivated it seems.
