That seems surprising to me. Ive seen more pulley lifts then any other kind of lift. In N.J. only a few teams are using 4 bar linkages and rack and pinion lifts.
Hmm... We have pretty much seen mainly xrail lifts... That's surprising.
Maybe we are misunderstanding you... we have 2 x-rails on our robot. Both use pulleys.
Oh. We use drawer slides with pulleys for ours.