Yes. Also good. But if someone has hacked their bike so its no longer safe or it enters a category where it needs different insurance or registration, it is easier to enforce before any dangerous behaviour has occurred. Otherwise its often too late, after an accident.

I think the laws where I am in Germany are stricter than the Netherlands. But it’s always worth trying more granular rules. Such as age limit, helmets for kids, fines for increasing performance, speed limit or ban in parks. This is fairer, but much harder to police than an outright ban. But big enough fines should be a deterrent. And might be preferred by fat bikers.