I get this app and I will use until my devices no longer receive updates (~7 years). Now I'm stuck giving you (and Apple) money forever. I don't care about any

I get this app and I will use until my devices no longer receive updates (~7 years). Now I'm stuck giving you (and Apple) money forever. I don't care about any features you may want to add, so the version I originally "buy" is the version that will serve me until I upgrade my hardware. This is the problem with subscriptions for apps without services - If I stop paying, I lose access to what I already have. That sucks. So begins the treadmill of money leaving my pocket and entering yours (and Apple's) for no good reason. I will find it even more grating when whatever features you do add to the app I don't care about and will never use. Just let me pay you for your work and we'll go our separate ways.