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In my experience it's because, for many, the concept of a "work device" is extremely foreign to them. They see no difference between work email on a personal device, and personal email on a work device.

Even I, a tech-literate person, use work devices in a personal manner. Sometimes because I can't be bothered to keep them separated. Other times it's because I believe it's required. For example, I have some scripts that I execute from my synced (personal) Google drive. Why? Because I made them in my free time, and they are useful at work too.

To me I think that every company should be strictly managing work devices but I also know how much of a pain that is as well.