Actually my ebike is still miles. Miles = moving parts.

Motorcycles in the US are also miles im 95% sure. You will see hours on things like tractors I believe or ATVs, even watercraft.

It’s really hard to gauge the overall health of a vehicle via one metric. Just because the car has 5000 miles on it doesn’t mean the previous owner didn’t do them all at 6,000 rpm in second gear for all you know.

This is also part of the reason quality electric cars have decent resale value after hundreds of thousands of miles at times; the drivetrains have many less moving parts than internal combustion engines, so the overall health of the vehicle is suspect to much less “witchcraft”.