They don't give exact locations like on TV. smirk
Which is why you are required to give an exact address in order to turn on wifi calling. Not that this helps if you aren't home.
I think it also depends on where you live and your coverage. Here, my phone knows where I am within a few feet. Seems like they should have access to that info. If my Maps can tell where I am... then the phone should be made so they can access that info too.