I can see a lot of advantages combined with runnign the new lighter fat tyres – the Schwalbes are about 1kg which is about the same as a magic mary I think?
The best thing about the fat bike tyres, ime, is that there’s no ‘stiction’ when it comes to absorbing small stuff. On the sort of stuff where the suspension doesn’t react the tyres just deform and roll over it. I think combined with the benefits of suspension for faster riding over larger obstacles it makes a lot of sense.
The thing is with fat bike tyres you do only have, at best, a couple of inches of undamped travel available on a fully rigid bike and when things get fast, steep and rooty they can tend to just start bouncing their way down things rather than sticking to the ground the way an FS bike would.