My dishwasher is rated based on specific cycles, but I'm legally allowed to use it as frivolously as I want. I can run an A+++ rated dryer with a single sock in and send the photo to the police.

We don't limit energy use but inefficiencies. The equivalent in crypto would be to rate hardware by hashes per joule.

Crypto things are different because the incentives are different. I'm incentivised to use my appliances efficiently as the energy cost is just a cost.

On the other hand with PoW, I'm incentivised to mine efficiently but as much as possible because I can buy a thing that turns electricity into cash.