Dyson focuses on over-engineering and clever-engineering. Sometimes those things get in the way of what is practical, best, or even useful.

But I am quite fond of my dyson upright and handheld vacuums. Their fans and other things seem more like novelties to me, but that doesn't make them bad, they just are what they are. Expensive and neat, but not optimal if you want to chase a metric or price optimum.