It can teach you that irreconcilable personality clashes do not have to destroy projects.
So is that all it was, "personality clashes"? Jeeze, I would have thought some technical visions of the ideal world, would have been behind it. I'm hoping this is more than a brainless contest of armwrestling.
I agree with the OP of this thread, covering up all the technical reasons behind a shroud of polite silence, is going to help noone. So, what's the difference between Catalyst and the new MoJo? I have no idea. And a situation like this one is not going to help anyone, especially not the outsiders.
Get rid of the mystery. If not, it can only hurt both projects.