Also, 99% of roads in civilized areas have something alongside them already that you can attach RFID tags to. Quite a bit easier than setting up an EV charging station (another significant infrastructure thing which has rolled out pretty quickly). And let's not forget, every major metro area in the world has multi-lane superhighways which didn't even exist at all 50-70 years ago.
Believe me, I've thought about this for a lot more than 15 minutes. Yes, we should improve sensor reliability, absolutely. But it wouldn't hurt to have some kind of backup roadside positioning help, and I don't see how it would be prohibitively expensive. Maybe I am missing something, but I'm gonna need more than your dismissive comment to be convinced of that.