So far from what I can tell, Final Cut Pro has gotten perpetual updates. Since you can only buy it via the Mac App Store, ther can’t do upgrade pricing.
They could - and some of the 3rd party vendors did: There is a 1Password 7 and a 1Password 8. There was also a Things 1/2, which is now a Things 3. it usually works by creating a new app, and not updating the old one anymore.