if you run network analysis you can at least see how much data flows between that device from the router level (and also keeps your personal stuff segregated from work stuff, regardless of any software on business machine). it also keeps your nice centrally managed work system from inadvertently accessing your own personal systems; i dont want my work apple/ms sending all the network-spam to my personal stuff and vice versa. Also think of solar winds and such, if your work system is compromised by a supply chain attack (seeing they are higher targets), you also dont want your other devices at home to be on the radar to be compromised too