What I believe you fail to understand this that Apple could allow side loading of apps and both you and I could be happy. That would not effect you one bit.
It will eventually.
Because it would drastically increase piracy, which will negatively affect developers, which in the long run will trickle down to consumers.
Then there would be lucrative defections from the app store, by developers looking to deny Apple a cut.
Both of the above would be less income and likely less spending on maintaining/improving the App store.
Basically the closed nature of the platform is directly responsible for much of the differences between the Android/Apple ecosystems.
If you prefer the way Android ecosystem works, you should vote with your dollars and buy Android devices, not try to get Apple to follow that path.