Well, that's certainly an approach, and I can see how it would work. Rather defeats the purpose of bothering with an MDM, of course.
It's not dissimilar to the way I run our macOS fleet, installing apps via Munki even though they're enrolled in Meraki. That's mainly legacy, because I simply haven't bothered to make all the apps available to the Meraki Systems Manager. However, the salient point is that, if I did, I could push apps out to my Macs from Meraki and it would just work — whereas doing the same for Windows clients is effectively impossible.
(Also unlike the Windows clients, having the Macs enrolled in Meraki even though I use Munki for apps still makes sense, since I can push profiles out and make changes to them even if they're just sitting there at the login screen. We simply assumed this would work for Windows as well, and, clearly, we were wrong.)
But thanks for the suggestion.