I would accept that Dyson products were probably a better design than the many ancient technology vacuum cleaners that hadn't been modified for decades. (I still won't buy anything from Dyson and stopped long before Brexit was a thing - grossly overpriced products that aren't anything exceptional.)
Not really, a Dyson, and any bagless vacuum for that matter, is not a great design and bagged machines (with decent bags) are much better. My Grans 1987 Henry with an 800W motor could hardly be seen to be lacking in power. The big issue was companies using high wattage motors for marketing purposes and to counteract terrible bagless systems, a 2kW+ motor is not required for a domestic vacuum.
Edit: to add to that a 620W Henry has only slightly less suction than a 1200W Henry, designs can be altered to make lower wattage motors work just as well, with improved floor tools and conical hoses being the usual methods to improve suction/pickup.
Admitedly there are some ~300W vacuums that are terrible and just don't work well at all but then we are talking about vacuums that would have been originally designed to use motors of at least 1kW with designs that cannot be made all that better to cope with vastly reduced motor wattages.
If you want a vacuum with higher wattage motors then you can still buy them relativly easily, just look for all-in-one machines as they can be supplied with a higher wattage motor, a Numatic George/Charles/Henry Wash/ Henry Wet & Dry all have 1000W motors and I believe there is a Thomas machine with a 1400W motor.