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I don't mind the idea, I'm in the US but I've got a 250w ebike w/the EU speed limit* just because it was cheaper... plus faster is less efficient and human power means I get less blob-like so it's a win-win.
Then again, it does have a twist throttle and I use this most often to slowly approach** or accelerate out of a stop sign (esp. crossing a road). Sometimes I've used it so I didn't need to pedal in the sun (I cannot really sweat). I've needed to use it twice when my chain fell off and I didn't have gloves with me. But generally my legs are contributing something... I wouldn't mind some sort of different throttle programming, but really I don't think my bike is one that is an issue at all w/throttle and throttle programming definitely wouldn't cover all of these scenarios.
Another thing is if I come to a stop and have forgotten to change gears, throttle is a save there too thanks to it not using the chain for its gearing. Or it can just mean less gear-changing in general.
*= 25 km/h (~15mph). I have not changed it, plus my bike (with me riding it at least) is not even quickly hitting this speed, most of the time I was going ~10mph. To hit motor cutoff speed on flat ground I'd probably need to be be in highest gear+PAS and be really putting a lot of effort in (including leaning down for less drag, I normally ride in a relaxed position).
**= cadence sensor does not allow it w/o brake usage