Yes... and no. The Windows Store works way better now than it used to, back in 2015. Now it's finally serviceable, but it's still loaded with junk that makes the iOS App Store look well-maintained. Discoverability is still poor (better than it used to be), and the number of people actually using it also remains low. So... it works, but it was hardly the future of app distribution on Windows.

As for the Desktop Converter, it's in the same boat. For the first few years, all it was, was a pile of PowerShell scripts. No GUI, mediocre documentation, run a pile of scripts to package your app for a Store almost nobody uses. Also the command to package the app requires Windows 10 Pro and, like, 30 command-line arguments that had to be perfect in order to work. Now it has a GUI, and more people use the Store than before, but the Store has abandoned the need to use it and now allows just directly downloading unpackaged Exes, rendering it mostly pointless.