So I bought a V11 during the prime day sale for $1600, which I still think is a great deal. However I learned the hard way that you can't push that wheel in "fancy" mode. I tried to ride up a roughly 4 inch high curb at walking speed, and it fried a mosfet. Fully dead, can only get power to connect to the app while plugged in. It has rolling resistance, which means fried mosfet.
I returned it to amazon, no questions asked, easy-peasy.
If you have a V11, DO NOT USE "FANCIER MODE" (which lets you pull more power and hit 34mph), unless you want to fry your device. If you don't believe me, youtube "overheat hill V11" to see how fragile this thing is.
So I put a bid on a craiglist brand new S18 and after watching lots of videos on it (including overheat hill) I'm convinced the wheel will cut out before it allows damage to come to the control board.
This setback hasn't deterred me at all. EUC riding is the most fun thing ever, and I cannot wait till I pick up my S18 tomorrow.
It's a fine balance between allowing the user to pull a lot of power, and not allowing them to pull so much power that it fries the board.
But I fully agree that it should be a solved problem. The hall effect sensor should be able to detect current down to the nanosecond and shut the board off instead of letting it get damaged. Kingsong seems to have that figured out while inmotion struggles.