Im pretty confused by this.
I have an SB66 alu, it has certainly managed far more than the "occasional trail centre black".
Geometry, travel and weight puts is as capable, if not more so than many including the 575, mojo HD, nomad, mega, enduro.
I dont see it as yeti's marketing either, they bill it as an all mountain bike, the go to bike for their riders that shred hard, designed with coil shock in mind, people happily using them for bike park.
It's only magazines that i have seen bill it as a leggy xc bike. The only reasoning i've seen behind it in magazines is that it pedals well and feels firm at the top of the stroke.
My experience of it is that yes, if you're mincing, it does feel quite firm, ride it hard, it is really, really composed, more composed than my old "freeride" frame with coil. I did have to reduce the air can volume to make things more progressive, but i was bottoming riding legit freeride/DH tracks, now the shock is more progressive, i just about use all travel on a 4-5ft drop into a shallow compression that you hit flat out on a local DH track.
It has 150mm of travel, 150mm travel that has to deal with small bumps OR big hits, 150mm of travel cant do both under hard riding.
An earlier post of mine summing it up.
Pedals exceptionally out of the saddle, handles high speed rough, big hits, gaps and drops with the upmost composure.
The mags have a completely different view of it to me, they have the view that it's a leggy trail bike because it isn't "plush" all the time. My view of it is, if it isn't feeling plush, you're not riding it hard or fast enough. If you're all over the brakes going into a steep rocky section slow, it isn't your friend, let off the brakes and go for it, super composed.
When do you need the suspension working its magic to work the terrain, when you're mincing around or when you're pushing it?
The firm beginning stroke also makes it pump really well, as well as allowing the bike to be worked on smoother terrain ala trail centres without sucking up all your energy like a sofa.
So it pedals, it doens't dull out smoother terrain too much plus it's really composed with lots of grip when it's rough/hitting gaps, is there anything else a bike has to do?