Sig, do you see that little symbol down at the bottom of the forgeworld site?
you know what that says? games workshop.
It's part of GW, that means it's rules are viable in official play. You can say "no your a jerk" to forgeworld users, but your more likely to play fewer games.
You can split hairs about it, but they are way more official then our opinions and feelings. They are even more official then the High admiralty. Do I like all their rules? no. Occasionally they come up with something pure gold (XV-9's and the tau crisis suits), and sometimes they are "flying to potato" stupid.