You don't have to buy a new stringer just to get a diablo. You could buy a Wise or better yet just the diablo. There are aftermarket diablos.
Here is the issue with no having a diablo. When the string is clacked in a [b]linear[/] gripper the angle going into the gripper is one value before tension is pulled on the string and the gripper itself mush withstand all the string tension. Wen tension is pulled on the string the angle of the string entering the gripper changes as the tensioner moves farther away. With a diablo the angle going into the gripper never changes and the round diablo an accommodate anle angle without damaging the string. The diablo also takes some of the pressure off the linear gripper when tensioning.
Everyone has the right to be stupid... it's just that some people abuse the privilege