Here's my use case: i used to ride 400 miles in a week, until my knees complained. Now I have a problem generating torque. I use my ebike as a class one (pedal-assist, under 20mph) EXCEPT when starting from a stop: I use the throttle for a few seconds until I get rolling.
I've never seen a "just for a few seconds" throttle. Add on the fact that I still like long rides (so huge battery capacity) and I've got a bike that could terrify the bike path -- if I rode like a jerk.