It's incredibly difficult to migrate even engaged users to the new, different app. Apple should really provide a better route for major version upgrades, especially on the Mac App Store.
If there's anything missing, they'll migrate. If not, they don't need it or don't care about it.
That's what I do every year when I have to renew my JetBrain products.
Do I need it? Will I actively use it? Is it just worth keeping the current version?