Removing the ultrasonic parking sensors was a downgrade, but removing the radar wasn't. The vision stack was consistently superior to the radar at the time they stopped including them; today it's leagues ahead. Even if you have an older Tesla with a radar sensor, it's been disabled in software because the camera-derived data is so much better.

The scary thing about radar is how terrible the raw data is, and how utterly compromised the filtered data is. Stationary objects have to get substantially filtered out when driving at high speeds, otherwise false positives would be unacceptably common. This affects all brands of car with radar.

This shouldn't be surprising. Subaru managed to jank together Eyesight using a couple of cameras and an in-house team, and they were able to make it outperform radar in most respects. Unfortunately they didn't think to make it self-calibrating, so it requires a trip to the dealership any time you replace the windscreen.