Why is there drama for such a small community? Angular doesn't seem to suffer from these constant HN threads.
Angular.js OTOH is run by Google, and like everything done by Google is part of their strategy to collect data and increase advertising revenue.
I'm trying to come up with similar software schisms: vi vs emacs? GNOME vs KDE? Linux vs BSD? C vs C++? C++ vs ObjC? All of these differences sound more substantive to me.
Unfortunately, that seems to lead to a lot of acrimony between them. I wonder if a big part of it is that each side is convinced there won't be space for both in the future, and that a clear winner has to be declared - which I don't think is true at all. This town is certainly big enough for the both of them :)
As for drama within the Ember community itself, that's a little more complex. I think a big part of it is that Ember seems to have a lower barrier to entry than Angular at first glance, but certainly has its own catches and hang-ups, and running into those when you thought you had found a holy grail can be extremely frustrating.