Have not read any of that stuff. I can see strength training modalities like jumping and sprinting being less of a problem than traditional squats. WHen I was training for Iornman, there was no way I could recover from any lower body strength training and still be able to put in quality sessions in the run and on the bike. I think most elite level endurance athletes would have the same problem. Why fatigue yourself with an exercise modality that has little specificity for your particular event? Besides, if I had an extra 30 minutes, that time was better spent on an extra run.
Stop and go sports like soccer, basketball, and football are different.