I didn't feel great doing my intervals yesterday. Halfway through the first one I was gasping for air and felt like maybe I mixed up the percentage. But since they were at a prescribed percentage of my FTP, I knew I should push through. Made it to the first rest interval, second one felt way better, third one was still tough as expected, but completable. I finished the full workout feeling great and not overly taxed for the effort prescribed.

Had I trained to 'feeling' I would have quit or done way less power than I was capable of. My power meter said I should be able to complete them, I did, hell, maybe I could have done more. But without it, I would have done way less.

I fail to see how being more experienced and/or Taylor Phinney would have let me use 'feel' to attain the same goal of the workout.

I'm not trying to tell you or your kid how to train, that's up to you (and him), but pretending it's some magical secret to train by a completely subjective 'feeling' over a concrete power number is crazy.