That's great if you work down the hall from the guy that wrote the language but unless you're talking about a niche in house language when it comes to web development you're talking about what half a dozen people that you can claim that against? And how many of those work at Google and the like?

The vast majority of people will never have the opportunity to be down the hall from that guy and for the vast majority of people a large helpful community will be infinitely more valuable.