Nice listing but i need to add something to...
...Myth 8:
Updates are (except some vendors and there often with additional costs) not manageable, only able to be blocked up to 90 days and then not able to be blocked for 60 days (except you block the relevant apps, which is a bad workaround).
So, not being able to be in full control of all oem updates is bad for enterprises.
...Myth 10:
You can't take control by 100% of app versions using apps being deployed by play store. This is also something which is bad enterprise.
...Myth 11:
It's not seperate but security implementations made for customer Android (limiting access to several parts of the system) are often just put in place without considering Android Enterprise still need the possibility to control/configure those parts (at least on fully managed devices or COPE).
So, having the risk of loosing possibilities in manageability on Android Enterprise devices is another bad thing for enterprise.
I'm definitely not saying Android Enterprise is bad but there are still a lot things missing in Android Enterprise (or going into the right direction) compared to other OS's.
I see a big potential to this OS also as a general OS on PC's, POSes and so on but the points above need to be go into the right direction first to be really compareable to other OS's.