> "I think what we're trying to do is pull back a little bit from the CADR metric," he said. "Not everyone needs an enormous CADR, has huge rooms or incredibly dirty air."

It seems plausible that CADR is becoming just a bigger number without improving effectiveness, like megapixels.

It also seems plausible that Dyson is just struggling to avoid commoditization because it's a losing battle for them. And it's possible some of that has merit, because running a noisy fan when the air is already clean seems annoying.