As a commuter-turned-road-cyclist I cannot fathom going on any ride without padded shorts or bibs (even if I have yet to understand very well why having the padding in the saddle is so awful compared to padded shorts/bibs).
Despite early hesitation and several reasons unrelated to the present question (including spending increasingly more time on trails), I am now convinced that MTB-specific clothing is just right for the sport.
Yet unlike road-specific shorts and bibs, MTB-specific shorts are mostly sold without padding. I suspect that this is the case because whereas road-cyclists-turning-MTBers imagine they are going to sit for 95% of the ride (and hence paddings matter) and stand for just 5% of the ride (where paddings are irrelevant), medium-to-advanced MTB riders—ones who never dismount on black-diamond trails and who go swiftly through berms—stand for a majority of the time, and hence paddings are not particularly important, and could even impede motion.
Can you comment one way or the other? Do you reach out for paddings—whether built-in or in liner shorts—or are you quite content with unpadded shorts?