Reality: JS is a great language, and that's why it won. The idea that it's merely the case that it was everywhere and that that is the reason it won is something that people who are sore tell themselves to avoid grappling with the truth. JS's ubiquity (a) was neither a fait accompli, and (b) is insufficient to completely explain its success—it only explains it if you're willing to overlook a lot of confounding factors.