There is no right or wrong here. It’s only a discussion and all scenarios are possible. And I respect your opinion, but you do lack understanding of what I’m suggesting.
Nobody has self-restraint when they have unlimited power at their disposal. Or at least, a rare few will, as has been proven by anythign else motorized when used recreationally.
You’re only wrong with the reference to popping wheelies. If you’re already riding along, and go to lift the front wheel with pedal torque + electric assist, it will do it. It also would have no effect on doing it with pedal power alone. This would be the case whether it was a power-wheelie, or a balance-wheelie(‘manual’) just the same. That’s the idea behind the ~5% or whatever close margin.
Said margin is also needed if you want to make tight turns with the e-assist, too
It wouldn’t be the wheelie police at all, unless you and your e-motor can break the rear tire loose and exceed the front wheel speed when you lifted it by ~5% DURING the wheelie. At which point you’re already at the balance point and pedaling or manualling anyway.
For a short time on dirt or sand, most capable MTBers can make the rear wheel RPM exceed front RPM under pedal power alone by maybe 20% at the most. And only a short time at that.
“Roosting” a berm on an MTB is a far, far smaller cry from what you can do with even 10hp on an old XR80 under power. And e-bikes at ~500+ watts of motor output have enough torque to probably match the XR80 up to say 25mph.
Chances are if you’re doing a power wheelie long enough for the front wheel to slow down and remove assist(or simply under pedal power alone), you don’t need the e-assist at that point anyway. By definition, if you are doing a manual, you aren’t pedaling anyway, so it wouldn’t matter or be noticed. As soon as you set the front wheel down again, speed match, and you get your electric assist back as fast as you can start pedaling again. The chances of the undriven front wheel slowing down to the threshhold of 5% slower RPM than the driven rear wheel during either type of wheelie are slim to none – unless your front brake is dragging even slightly or you’ve got really bad wheelbearings…which you would have noticed whether it was an e-bike or not. Or, you use the front brake during the wheelie, which you’d learn not to do or didn’t need to be in the first place.