Max is a busy man...I am GUESSING that if he had the time, he would have said something like
this:Washers can be of use in a link system when used correctly.. as in tightining the articulation of a tri-angulated 4 link..( as an example)however.. If you are running a two link, you would not want to use washers, as they would bind up the joints that much quicker well i think that is the "tip of the iceburg" answer.. i put on my official Bio-shop coat before i started typing, so i hope i did good!!