Thanks to that, there was an huge improvement on training theory in the last year: things like VO2Max or Z2 where unknown in the '00I had my VO2Max tested forty years ago, and "Zone 2" training is just a rehash of Arthur Lydiard's coaching from the 60s. This stuff has been known for decades, but just repackaged with new marketing and sold again. And I'll guess that nearly every pro in the peloton had a power meter on their bike during the "Lance years". Had one on my race bike at that time.
Beside, you can collect all the data you want, you still have to do the work. I've known plenty of amateur cyclists that thought staring at power meter graph would reveal the mystery of why they suck, when the problem is too much staring at the computer, not enough riding.
