Why is vacuum motor power rarely listed in the US? Looking for a good all-in-one vacuum

While I was living in Europe back before the EU started limiting the power of vacuum cleaners, the main spec that was always advertised was the motor wattage. The higher the watts, the better the vacuum (at least that’s how it was marketed).

Here in the US, though, it’s nearly impossible to find out how powerful a vacuum’s motor is. Sometimes they list suction power, but even that doesn’t seem to matter much to the average consumer.

I get that many vacuums here have motorized brush heads, and that lately people are more focused on features for pet hair and messes, not necessarily regular deep cleaning of an entire home.

What I’m looking for is a solid vacuum for a 1200 sq ft carpeted home. No pets, just kids. We like to keep things very clean and as dust-free as possible.

The Dyson V15 was a big disappointment, too weak for cleaning a large carpeted area. Miele (at least the model I tried) was awkward and impractical with the motor unit and bag constantly dragging behind me.

I’ve seen a lot of models like the Shark CarpetExpert with water tanks. The price seems nice, but are those really good if I just want to vacuum carpets weekly or bi-weekly?

Also, can those even handle hard floors without making a mess?

Does a decent (not necessarily high-end) all-in-one device exist—something that can vacuum carpets and also handle dust on hard floors?

What would you recommend?