I do not know how you can be so sure... i am always a man full of doubts, i am always amazed when someone makes such bold assertions.
I can't agree with you here, sorry. When i look at XF, it is only good at classic forum software. But classic forums are "no more" and they are dying. IPS has followed a different strategy, and imho, a right strategy, of putting a set of tighly coupled apps for community management. The other company that has been following that approach (but they have always taken that direction is Wolt Lab with corporate customers, still, they are lagging behind IPS in aplication effectiveness, comprehension and looks.
To me, there is nothing appealing at XF, only if i wanted to have a gaming forum i would consider them.