It doesn't change the fact that studies have shown that there are muscular and skeletal benefits to weight training. That means it has benefits to all efforts. Which was my first point, but you focused solely on my track comment.
No, the track comment was an afterthought. I addressed your initial point, which is flawed. It's an aerobic sport. Over and over. Strength is not going to be your limiter.
Your aerobic abilities are.
And you do know that there is more than just the kilo for track racing? If you race on the track, you are not just purely sprinting and there have been several track racers that have become incredibly successful road racers - very few are sprinters for that matter. for example, you need an incredible engine if you want to be successful at the individual or team pursuit. In fact, one of my friends won bronze at the world championships for individual pursuit and the year after that won a national road title. There is significant translation between the two disciplines. I know for a fact that weight training was part of the training regiment.
But back to my original point. Look at Nino Schurter or Peter Sagan, they do work in the gym. Nino makes videos of his gym routines. They are not neglecting their normal riding, but adding it in addition to their riding and it is paying huge dividends to them both. Unless you are trying to maximize your ability over big climbs, weight training can help you as an athlete and for your overall health.