Yet not a single concern about tethering an iPhone (with an external connection) to a PC on the company's internal network, bypassing all firewalls, proxies, and other protections. That is grounds for immediate dismissal at some places.
I expect security people to think more like network engineers and less like teenagers gossiping in the canteen.
Also, there are two orthogonal concerns at play here: Companies generally don't want personal devices (at least those not covered by MDM) to hold company data, but companies also might not want to inadvertently hold personal data of their employees.
https://support.apple.com/en-us/120421
Under iPhone Mirroring system requirements
Your iPhone and Mac are signed in to the same Apple Account using two-factor authentication.
Your iPhone and Mac have Bluetooth and Wi-Fi turned on.
Your iPhone is not sharing its cellular connection (Personal Hotspot is not in use).
Your Mac is not sharing its internet connection or using AirPlay or Sidecar.
Lots of people who are entitled to a corporate smartphone also have a single phone with two sims for work/personal, because of the same reasons: cheaper, more convenient, large data plans on corporate device. These devices are MDM enrolled and the company will at least check what apps are installed.