Microsoft has released their Desktop App Converter (see https://developer.microsoft.com/en-us/windows/bridges/desktop) that allows Win32 apps to be published in the Windows Store. It would be great (if it's possible) to be able to install and update Fiddler from the Windows Store.
I would be glad to see Fiddler in Windows Store. Benefits for user are seamless install, uninstall and updating. For developer - discoverability, feedback and reviews, crash reports and other analytics. Moreover, on Windows 10 S the only way to get a program on your PC is the Store, and 10 S will probably replace Home in future, would make sense to have a presence there as well.
It would be helpful to understand what benefits you believe this work would provide. Historically, I avoided doing this as it's a non-trivial amount of work with little upside.