I agree with you here and that's why I'm mildly surprised they haven't come up with a solution rolled into iCloud yet. Syncing apps and preferences shouldn't be that difficult, but unless they're App Store applications the binaries would take up a lot of space. Most of the apps I care about are from outside of the App Store. AFAIK our iOS backups don't actually back up application binaries.

The way I was looking at it is that Apple has successfully sold iCloud+ 2TB plans to a lot of people who don't need much more than 200GB. If everyone on the 2TB plan used even close to 2TB, I'd bet they'd have to charge me a lot more to make up the provisioning and usage costs of storage.