Why should cars not have governors, but ebikes should?
Same way how(at least over here) anyone can ride a 50cc motorbike without any training whatsoever, but to ride something more powerful you need a proper motorcycle licence. I'd be happy with some sort of process where you can only ride a 250W ebike with no self-drive without a licence, but more powerful motors are available after passing a licence and with mandatory insurance.
(I am not a fan of overregulation. In the USA we have made practically everything illegial.)