Booting into personal mode wouldn't protect the user from having to return the laptop without notice in the event of layoff/termination, without any opportunity

Booting into personal mode wouldn't protect the user from having to return the laptop without notice in the event of layoff/termination, without any opportunity to recover or erase personal info. It also doesn't nullify the right of the corporate IT, HR, legal, etc. to inspect any data on the machine, personal or not, at any time. It's utterly not worth it even if it were offered.