But that's one app model. Does Apple still allow for models like that?
The model currently used by a number of apps - webapps, Electron apps, browsers, operating systems - is that of the "evergreen" model, where they continuously update. But this is where Firefox is dropping a bollock; they do BIG updates, rebrand it with things like Quantum, and push MAJOR UI updates.
Contrast this with Chrome which, from a user (i.e. my) perspective has only done incremental updates. UI changes have been small and subtle. This page [1] has a number of screenshots from the old version of Chrome. I have a dark theme going on now but it's not changed that much at all. Chrome has never been a brand, hardly a product, as opposed to Firefox which is still stuck in the 90's / 2000's where they only get interest if they do a new version.
That was the old model for Windows, Office, Adobe products, etc for a long time as well - they HAD to make a new "big" version to keep sales going. But customers did not HAVE to update, so they would often stick with older versions - things that worked - and e.g. Adobe HAD to come up with new features to convince people to upgrade.
But it's all gone to subscription services now, which come with "evergreen" updates.
One more anecdote I'd like to do: I've been using 1password for years now, because for me it worked best as a crossplatform password manager (Windows, Mac & iOS, synchronization via Dropbox). They switched to a subscription model a while ago, but the versions I have were all paid for in single purchases. On Windows I'm still on 1password 4 while on Mac it's 1password 7, and thankfully the two are still fully compatible when it comes to their data. I'm sure this won't last, but as long as I don't HAVE to update (and as long as their encryption is solid), it'll be fine to just keep the version I have now - That is one company / product that cannot afford to be flippant about their customer data, data format. I've got hundreds of accounts in there, if I were to lose it it would be... pretty bad. At the very least I should write down my gmail password and double check my recovery codes because everything is linked to that one account. Anyway I ramble / digress. Stuff.
[1] https://www.techrepublic.com/pictures/photos-10-years-of-goo...