In the vast majority of cases, a "business phone" needs to be able to handle email and calendar items, and view documents/PDF files as well as being able to connect to the corporate network. Ideally they should be able to be administered through group policy/MDM. Personally, I don't mind my 950XL being subject to my company's IT policy. Having it wiped doesn't bother me as all my stuff gets synced to the cloud. My firm's policy doesn't allow for tethering (even though I pay for my own internet use), but I hardly ever user that so it doesn't bother me that much.
In reality, business users are just as fickle and prejudiced as ordinary users and would prefer to use Android or Apple devices (i.e., they have to be seen to be using something that's commercially relevant).