But even then, there are weight limits in professional racing so it must be a bit of a moot point for the pros.
True enough, but it's only relatively recently that those weights became an issue. As recently as the early 2000s, a pro's bike might have been as much as 8kg
What I'm really getting at is that any other level than Pro, fitness and body weight are faaaaar more important. At pro level these are already optimised so bike weight becomes the thing