All opinions will vary to some extent and it's definitely true that lots of LF folks use Pyro. There is absolutely nothing wrong with doing so, as the pyro developers are fantastic. In my experience however I don't see the advantage over XTol or D76. You're already in a world of grainless images with fine detail. I'm guessing the largest most photographers go is 16x20 or 20x24, and for sheet film this is not really pushing the envelope. When it comes to a particular response re contrast then it's really don't to the individual photographer to choose a developer that suits. However when it comes to reducing grain or increasing contrast you have various stocks that will go farther than developers can. You can go from HP5 to FP4 or Delta 100, similarly if you need the speed but still want to minimize grain there is TMax 400.
On the other hand if you have a Hasselblad and you want to make a 20x20' print, you can take your negative a lot farther by using a pyro staining or otherwise high acutance developer or technique. It's in those circumstances where IMHO you see the big difference. Despite saying that, if you have times that work for you for 120 let's say FP4+, the sheet film times are probably not far off, so I can see just sticking with them even if it's not strictly necessary from an image quality perspective. At the end of the day we all find our own preferences. Many people, I suspect, simply enjoy trying something different. Nothing wrong with that!