afaik, those numbers just don’t tell you a whole lot about the actual power of the motor. A “250W motor” could produce peak power output of 1kW during short bursts, as long as the average power over a longer time is at or below 250W, they’re fully legal.

Not really, a 250W (average, not peak!) motor can exceed 25km/h easily on flat ground, the only difference to a stronger motor would be the acceleration.

Disabling the electronic limit is the issue.

It’s so easy to hide a little switch to toggle “bike legal mode” on many models, in my experience that doesn’t really stop people, sadly.