Organised 10v10's currently happen all the time on West and are increasing every week.
I don't know if the games are being streamed, but Early Endgame (TF) vs. PTL (FB) 10v10 happened yesterday. The day before that DoD (WM) vs. PTL (FB). Whitemane horde are also consistently running 10 in skirms. There are two new guilds currently gearing teams to compete. Guilds are very active at the moment, testing out class comps and players verse each other. If you joined the 39's discord, where the majority of the community discussed everything 39, you would see this. This forum is great, but not really an accurate indication of what's happening in this community. Your best bet is to join the discord, the link is in a pinned post at the top of this forum. I won't say you should move West because clearly you prefer facing pugs and small groups, but get your facts straight when you are discussing the West, where most of the competitive 10v10 community resides.