I reckon most people don’t buy a bike that’s perfect for trail centres, they buy a bike for whatever else they ride.
Some people only have one bike for Alps, DH, Mountains, Pootling and Trail Centres. If I went to Coed Y Brenin etc I’d have to pick from my DH Bike, a 160mm hardtail or a 140mm singlespeed. Perhaps the singlespeed wouldn’t get me too many sneery comments on forums, but the others aren’t the right tool for the job.
I’ve ridden the DH bike round CyB last year as it was the only bike working, was hard work, good fun, probably got me a few funny lucks from the people I was overtaking, but that’s just how it is for me and lot’s of other people.