That’s because they are using a rain sensor while Tesla trying to use the cameras.
Every automaker uses cameras to detect rain. There are no other "rain sensors"
Some just program it better than others.
Tesla auto wipers used to work ok but now seem to be disabled.
Tesla autowipe logic had been mocked with with every other software update.
Some make it better, some make it worse. None make it "good enough".
For example, my wipers always go into frenzy mode whenever I pull into my garage with a peg board. It has been a 100% repeatable and laughably idiotic behavior for the past 5 years. Given Tesla's track record, it will continue to be the same for the next 5 years.
I use voice commands or stalk button. I’ve heard you can adjust the speed with the left steering wheel button by clicking left or right.
Manual mode is the sweat spot for me.
Sadly, the car lacks a wiper stalk, so I have to take my eyes off the road to adjust the speed during rain events.
It is what it is.