I'm toying with adding an XC to my N+1 arsenal and Chimney Rock is my home trails. I have an Enduro and an all-mountain e-bike both which I mix up riding at CR.
To me, the chunkiest part of CR is Lemon Twist on Yellow and Lo-Tech and Hi-Tech green. I've ridden a fat tire bike there (slowly), I just don't know if those balloon wheels are better or worse than the 60mm rear travel on the XC bike. Would I end up avoiding these spots on an XC or tightening the death grip and just hoping to not break anything (on the bike).
And.. I hadn't heard about the broken collarbone person but I broke a rib attempting that drop through the chain link fence 2 years ago. And I can't even say I was cool and attempting it as a drop, The first time I tried rolling it (too slow), I hit one of the roots square and went OTB, into the bushes at the base and landed right on a rock. To this day I still go just past there and make the next right to take the scenic way down.