I’d imagine this to be the case. Running has a big durability and efficiency element to consider. I was a good mile to 5k runner as a teenager, but unfortunately born with a big engine but terrible biomechanics. Messed up my lower legs royally and called it quits.
At 39 with 18mos of training I’m around 5wkg and pretty good numbers from 1min to 4+hrs. I’ve done some cycling and a bit of racing in the past, but just a year or two here and there. First time training with power or any structure. Cycling let’s me make the most of my engine with limited stress on the body. Managed around 600hrs last year and aiming for similar in 2020.
Point being, I’ve banged out some random 5k in good times over the years but to train for a 2:15 marathon would break me, literally.