Which is partly Microsoft's fault because Enterprises should have easily embraced the Microsoft Store for Business (emphasis on the "for Business" as a part of the name following one of Microsoft's more confusing name patterns; it's a separate more customizable "store front" than the "not for Business" consumer store): it's a lot nicer UX than System Center's "just ported from Silverlight" Vista-era ugliness, has more features than System Center (including easier license management for applications sold on the non-Business store), and better install technology. In one of Microsoft's many "forgot to build a bridge" problems with the Store, they forgot to provide easy upgrades from System Center, especially for the then (too many) companies still supporting Windows 7 side-by-side Windows 10 installs up until the security support deadline.

It's probably still too early to tell, but App Management for Microsoft Teams, updates to MSIX, and better Windows 7 compatibility for companies over-paying EOL extended security support agreements, at least for Microsoft/Office 365 companies, has opened the door to enterprises re-evaluating the Microsoft Store for Business. It might actually replace System Center like it was intended to, just years late.