Joe_Lurie - Did you know some of those ideas are no longer current?
You cannot block the MS Store on Windows 11 and use private only. MS now blocks the store entirely if you try, the effect it creates that no app will publish nor keep up to date with app store on Windows 11.
There is no path to buy apps at this time for enterprises via the app store. You can only buy single one off licenses and they cannot be deployed to the organisation. Adding to this you cannot then download an app once purchased to then deploy vie MEM. The only way for this step to work is if the app is 'free' on the app store for business/education. I did manage to buy HEVC Video Extensions via our MS Partner, however will not keep itself up to date and in VLSC you can only access version 1.0 not any recent revisions.
WPM does not work neatly in MEM. It requires packaging and script after script after script. As such I do not see this as a viable path forward.
As the MS App store doe not neatly integrate with MEM, you cannot automatically keep apps up to date. Was a nice feature in MEM/Private store configs. Will this make a comeback?
Note that Company Portal only works for apps that allow installation via user mode, there is no elevation integrated for device apps. Which most LOB Apps require. Was super hand in the private store. I liked the idea of 'optional' and had a go at rolling it out, however, does not actually work in production.