The best shooters I've known seem to do pretty well no matter what gun they're using...
True to a point. But the serious
shooters (a few of them whom I would catagorize as "best") I shoot with in Bullseye matches invariably opt for the most accurate pistol they can afford to compete with; both in terms of its intrinsic accuracy and a configuration and features that enhance the shooter's skill level. And that includes getting the best trigger possible. When shooters reach a certain plateau in excellence, the little things start becoming bigger and, if they plan on visiting the winner's circle with some degree of regularity, those "little" things (a mediocre trigger pull as opposed to a "fine" one for example) need to be addressed.