I download 0 new apps per year, but I use WhatsApp, Outlook, and Google Maps. Today, I get them all from one store - one password to remember, one credit card to have, one stupid set of "security questions" to forget the answers.
Tomorrow, Facebook AppStore will be the only place to get WhatsApp, Microsoft AppStore will be the only place to get Outlook, and Google AppStore will be the only place to get Google Maps, so I will need to download n app stores to get to where I am today. Create n accounts... accept n privacy policies... activate two-factor n times...
Yeah, no, thank you but no. I'm pretty happy with the AppStore as it is, thank you very much.