I think it depends on just how steep you're talking about. 67 degrees seems pretty good for both stability and playfulness. I don't think I'd ever enjoy a trail bike with 69 or greater HA.So I once had these same thoughts, get a dual slalom or slopestyle bike for playing on trails, but then I bought a good one .... and it sucked! Squirrely as all get out, made me think I was gonna die.
Steep HTA are terrible for playing around, they're twitchy at speed, terrible on landings, require more skills and more concentration, not forgiving at all.
Short wheelbase and short chainstays, yes, but not a steep HTA, oh hell no.
The new Shred Dogg looks pretty slack, but with the shorter chainstays it could still be a very fun bike.