Originally Posted by
Carbonfiberboy
If like me, one has the time and recovery to train on the bike an average of ~10 hours/week then it's still the same problem: you'd be substituting training to run for training to cycle. And they are not the same thing. If they were, tri would be no thing.
But you have already said that you do other stuff. It's not so much about the running specifically, substitute any other exercise, like hiking. Cycling is particularly constrained and repetitive as sports movements go.