It will not be as simple as that, but you will have got the idea: one of the most important aspects of the 'climate' in which a gene is favoured or disfavoured is the other genes that are already numerous in the population; the other genes, therefore, with which it is likely to have to share bodies. Since the same will obviously be true of these 'other' genes themselves, we have a picture of teams of genes all evolving towards cooperative solutions to problems. The genes themselves don't evolve, they merely survive or fail to survive in the gene pool. It is the 'team' that evolves. Other teams might have done the job just as well, or even better. But once one team has started to dominate the gene pool of a species it thereby has an automatic advantage. It is difficult for a minority team to break in, even a minority team which would, in the end, have done the job more efficiently. The majority team has an automatic resistance to being displaced, simply by virtue of being in the majority. This doesn't mean that the majority team can never be displaced. If it couldn't, evolution would grind to a halt. But it does mean that there is a kind of built-in inertia.
