So you keep saying, although don't see any evidence for it. MS want you to move to using the MS Store, because that's not terrible. Or manually download multiple files, put them all in specific places and use a powershell script to install it, hah, so easy.
MSIX is just a wrapper around an msi, exe, etc installer anyway.
Much easier to add an MSI to GPO, and then just as easy to remove it again and it's uninstalled.
Not sure how writing scripts to do all that myself for every piece of software is better.