A non-terrible MDM that actually works would be really nice. The rest I doubt they get much traction on. Gmail is too easy, Google docs and sheets if you don't need Microsoft is also way better than Apple's free apps.
I can say that the MDM solution I went with leaves a lot to be desired, but it works and it’s cheap. Since I’m only managing iPads, I really wanted to go with Apple for the simplicity, but, like I said, the price was too high (at the time at least).
Not a particular area of expertise for me, but the times I've had to deal with it just seemed like an inherently complex and messy problem.