I bring this up because this was actually a talking point during Brexit, and the excitement that Finally! Brits would be able to buy good vacuum cleaners again now they'd left that pesky EU. I've got no idea of the status of that particular regulation today, but I know that I haven't heard a single person mention it since the days of the Brexit vote.
Power ratings don't correspond to performance if the world irrationally decides that higher power means better. If the low end landlord special dishwashers can't make do on 1500w, then perhaps they just shouldn't exist. My landlord special cheapo dishwasher here in Canada however does a completely fine job using the cheapest powder I can get at the supermarket, as long as I load it properly, and haven't absolutely burnt the shit out of something in a pan.