Short arms don't cause it, but long arms allow components to last longer and become more resistant to DW. The improved angles are allowing my bushings to last 4 times as long as they did on short arms. Ride is smoother.
So far the LCA's haven't held me up on any rocks, sure I hit them but they just slide over them. I am sure I'll eventually find myself in a situation that they'll hang me up, but until then it is my belly that gets me stuck.