Not many Programs on the App Store
According to Appshopper.com
out of the out of a total of 4,030,978 Total Apps Approved by Apple 1,057,224 currently appear in the App Store. Of those 23,373 are for the Mac, 324,061 iPhone Only, 38.410 iPad Only, and 671,380 Universal apps. This number is down from last year because Apple has tightened the App Store requirements after some shady — if not outright malware — apps had managed to get on the App Store.
Personally I preferred the old App Store app to the new one, but admittedly the new one is probably better for the iPhone and like it or not there are tens of millions more iPhone customers than Mac customers. Which explains why there are hundreds if nit thousands of more developers working on iOS apps than there are working on Mac apps. That and the fact that the computer market gets smaller every year as users migrate to smart phones, tablets, and even wearable devices instead of a computer. (Why should a user buy a MacBook Pro when for $1,000 to $2,000 dollars less they can get an iPad that is arguably as fast, has builtin cellular capability, significantly better battery life, is lighter and easier to carry, and is capable of most of what the computer can do? For example, my wife has given up her iPad because she feels she can do everything she wants or needs to do on her iPhone and it is far more portable. To carry the analogy one more step, she often leaves her iPhone at home because 80% or more of her use can be done on her Apple Watch. But she still clings her Mac mini because of its larger screen and keyboard feel.)
The trend is highly unlikely to change, but with Apple's new APIs in Catalina and iOS 13 there is the possibility some (many?) of those "Universal" apps will include MacOS as well as iOS variants.
I can't agree that it is shameful that Apple and the App Store have made multi-millionaires out of a substantial number of developers and are holding all the developers to stricter standards to help ensure user's security and privacy.
If you want complete freedom go down to Fry's
, buy individual components, and assemble your own PC (or even a Macenstien), install your choice of the available versions of Unix (maybe even the BSD Unix that underlies MacOS) and get your software from Source Forge
, The Open Source Initiative
You would be free to customize those apps to fit your individual preferences and add features you want. You would be pretty much free of any restrictions except those imposed by the various standards entities such as IEEE, W3C, ANSI, ISO, ACM. etc.
and, of course, your ISP, and sites you visit and post on.