I owned a carbon Bucksaw for a while. It is such a niche bike that I sold it after a year or so. It was super capable on single track mountain bike trails as far as climbing and traction in the loose stuff. I had built it with a gx Eagle and the gearing as well as traction with the 3.8 Nates made one hell of a climber. I could clear stuff that I’ve never been able to on my FS Sight. But... the crappy Bluto fork and the added wheel/tire weight made for an exhausting trail bike. It also couldn’t fit wide enough tires for the sand riding I do. Can’t say I really miss it other than when I see them listed for almost double what I sold mine for.
I think a fatty with full suspension makes sense in a few (very few) situations, a hard tail fatty with a decent fork makes sense if you use it all year and trail ride with it. But for snow, sand and general riding with very few trail outings the weight penalty of those huge forks just isn’t worth it... not to mention the taller stack height on bikes that are designed for a shorter fork.