But it’s up to you installing a 3rd party store. I know I won’t be installing one, and most people will do the same, I suspect.
True but what do you do if an app you really want is only in a third party store?
1) You install and configure an additional app store and get the app
2) You don't get the app
3) Today: You get the app without installing an additional stores because developers feel forced to be in the App Store
#3 is the better choice for me. I don't even want #1 and #2 be possible.