While this is certainly a welcome option, third party app stores like F-Droid work just fine. The main repository contains only free software compiled by the F-Droid team, but other user-addable repositories can contain anything.

Additionally it is already possible to download APKs as they are hosted on Google Play from sites like apkmirror.com and you can even install the Play Store if you have microG and are so inclined.

There's no lack of app distribution :-)