I've never had clothing that was specialized for cycling, so I'm kinda n00b in that area.
I am confused about the use of spandex.
It's very common among roadies, for obvious reasons. It's more comfortable, has less friction on the seat, and is more aerodynamic.
Why doesn't it make sense for mountain bikers? You do see plenty of XC riders with spandex, but not in "120-160mm travel" areas like trail/enduro. Those guys seem to use basic shorts of one type or another, that catch air and might catch on branches.
Why isn't spandex just as common in the mtb circles? Is it a cultural thing?