I don't know if this is a problem in other countries, but at least it is in several countries in Europe...
At least in Spain, the EUC's are not illegal, but the main problem is that the maximum allowed design speed is 20-25km/h, and obviously our favourite EUC's (from Gotway, KingSong, Inmotion, Ninebot...) are sold with maximum speeds way higher than the maximum legal speed.
I thought a little bit about it and I guess it'd be a good "solution" if the manufacturer could sell the EUC's with a maximum default speed up to 25km/h (call it "max safe speed" or whatever), and it could be "unlocked" by SW or FW (just the same way like now limiting the tiltback to lower speeds, but in the opposite way). This way we would ride completely legal (except for maybe the max power), but also allowed to unlock higher speeds (of course under user's responsibility).
What do you think? Do you think it would be a good idea to be implemented in new EUC's?