When you don't use a stackmat, your pickup and stop times are significantly shorter. This is why the 2x2 WB is 0.26. (Correct me if I'm wrong.) You can save 0.3ish off your average by using a keyboard. You can also save 0.3ish off your average by drilling your pickups on stackmat. This matters a lot for events like 2x2 and it can turn somebody who averages low 3 to just barely sub 3. (You can do this by putting the cube very close to the timer and to train yourself to grip the cube in the right way. Just don't have the cube touching the timer, as that's illegal.)