This is exactly why I’d only have it disabled at home, too. I’ve received a few notifications from the Xfinity app telling me there’s a new connection at home, but it’s just been my same iPhone. I’m sure it’ll all get better over time, though.Maybe some people have various rules/config in their router that otherwise wouldn't work.
As a related example, I disable the "Private Address" option when on my home WiFi (which would othewise scramble the MAC address) as I want my router to know who I am and allocate me the hard-coded IP address I've set.