My only road bike is a CX. Boardman Disc one, fwiw. Not generally a problem keeping up on club runs (just pick the right group).
I got it for two reasons, one so that I could commute on the road but come home over the military areas when time’s less pressing, second because commuting in town it’s a bit more upright and with chicken levers I can sit up high and still brake. But I ride it more and more – my original MTB’ing, 20-odd years ago was taking a rigid boneshaker up farm tracks, over hills, down bridleways, just to see what’s around the next corner. Then I got into suspension, and singletrack and roots and drops, and all that. Gradually as I got older (and bounce less) I tend just ride bridleways and farm tracks and go over the hill to see what the view’s like and…… and my CX does that better than either of my MTB’s