We should also remember, that while FAQ 2010 did change lots of stuff for the better, in many places problems ran way deeper. Official rules gave us broken Necrons and Eldar that won or lost battles during determining battlefield features. FAQ never intended to change this things, and other bigger balance issues, so other, less official update, was needed in oppinion of some.
Also, years have passed and FAQ is still not in the slightest acknowleged by GW. So it's just as unofficial as BFG:R. But do people care? Not really. It was needed and it's used in many gaming circles. So, seeing that 'official' has lost its meaning, this big issues that FAQ never intended to touch can also be fixed.
Yeah, BFG community isn't really doing much to promote the game to the broader audience, but really, what would it change? We are not getting official update, nevermind how popular the game will get now. And if we do get it, seeing what happnes to the 40k rules and setting now, we will wish we didn't.
So what is left is mend the broken parts as good as we can, for those few who care about it and keep playing. Is anyone really bothered that wargaming community has barely heard about his game?
Yeah, BFG:R is just a pretty house rule compendium, but for most of the player base, this game is never really played outside of the house.