This is a really interesting discussion and follows on from what we were talking about in the car Kaiser.
I tend to take the splatter out if I want a no hassle, comfy, mud adventure and not just at trail centres, local rides too. This is partly due to my need for a longer top tube but also I appreciate the front bounce and the geometry seems to be a better fit compared to the more race set up on the orange.
The Yo is being built to see if it can combat this urge and should be as reliable (SS Rocks) and may be as comfy (over most xc stuff) and if my wish comes true, then it should be automatic first choice.
However unless you get NOS retro bits, they will not be as good/reliable as new components (15yrs of development has made things better- it has to be admitted), so I suppose its up to our willingness to accept the shortcomings of retro for the fun and camaraderie that you get riding beautiful but ageing machines and this willingness waxes and wanes dependent on the most recent thrilling outing- SSUK on the dale for me, real high point for me- or the last man cave frustration session- spindles and collars **** for me!
That said I like to be a bit different than the herd so retro for events is a default setting but like velo said happy trails come from happy riders so just bring a bike and get muddy