If you are a decision maker, you might find your personal stuff subject to a subpoena for any number of reasons. Antitrust, insider trading, harassment suits, all sorts of legal fishing expeditions. Its convenient to be able to just give them the corporate burner, and get another. I know a few people who had to go through this with their personal phones and this is a horrible experience. For once, you lose your phone there and then and are explicitly forbidden for tampering with anything replicated to iCloud.

A friend of mine is a svp of something something and his corp was sued by antitrust regulators. One day police is at his doorstep - not even a legal letter - and they took his phone then and there. Super disruptive, considering one usually has a lot of MFA tied to the phone.