So basically the Store team has re-invented a self-extracting EXE sideloader for UWP apps that contains all the dependencies packages in one file? Just like how Dell or HP's crapware apps are deployed.

On one hand, you wouldn't need store.rg-adguard.net for offline versions of web launched apps. That's a plus, but then you couldn't pick an older or newer version of the app like with rg-adguard.