They specifically mentioned the enterprise ecosystem.
I would not be surprised at all if Apple's MDM system is less painful to use for smaller businesses than Microsoft's AD and everything attached to it. Hell it might even be nicer for big orgs, but I've never heard of one (apart from the likes of Google) not using AD
Also if you're already dealing with one of those systems, an IT department is probably motivated to not run both and set up interop if they can avoid it