The reason why you do not want to co-mingle personal and work compute resources. If you are part of a legal discovery request at your organization, any device used to access corporate resources is at risk for retention. Suddenly all of those private photos and messages are not so private. So do yourself a favor and never ever ever mix your work resources with your personal devices. Never.
A double click of the middle mouse button and I can instantly switch between my work laptop and my phone. Interacting with my phone with a keyboard and mouse is surprisingly fast and easy.
The most common scenario is when people conduct business via text/iMessage/WhatsApp/etc on personal equipment. It’s easy to establish that the phone number doesn’t belong to the company.
If you do that for convenience you should have a practice of regularly cleaning up your personal stuff (or work stuff as applicable) periodically. If you have a consistent practice, you avoid exposing your entire personal/work paper trail while avoiding getting tagged for destroying evidence.