I guess I just don't see much downside to putting both on the same device. I have trouble picturing a situation where I'm significantly worse off because of the path I've chosen compared to having two devices. The 99% worst case scenario is something like what happened to the person who was fired: my phone gets wiped when I didn't want it to be. Ah, well. With Android's backup capabilities, it takes me about an hour to be back to normal from a completely wiped device. I've wiped my device voluntarily just to give it unlocked to a repair person. It would not be that much worse to have to recover it involuntarily. The 99.9999% worst case scenario is that my employer is monitoring my private communications for some sinister reason, but I consider that pretty unlikely. I just can't see a way that would benefit them, and I'm not sure they even have the capability in the first place -- compartmentalization is what work profiles are for.
On the other hand, having to manage two devices would be a daily tax. So, yeah, I'm happy with my choice, but I'm happy to accept more information if you have other things I've not thought of.