FindMy relies on the device either connecting to the Internet or pinging a nearby device that does. This would mean Macs always visible in FindMy

I'm probably a small minority, but I would trade my phone in for a clamshell/dumbphone tomorrow if my Macbook had 5g. Separately, tethering seems to blow through my phone battery.

Convenience and also for corporate devices, so you don’t need a company phone to get data on the go