I am aware of it and it still doesnt purge the multitude of layers. It brings them down a bit.. but doesn't do a very good job.
Personally we should have the option of keeping ALL our ductwork or pipe or what have you on a single layer and purge the ABS junk out. It should be as simple as making the blocks for teh ABS components on 0 layer, with the set colors and linetypes they want for display.
ABS focuses FAR to much on gadgets to solve simple issues controlled by good simple layer and block convention/creation. Key here is SIMPLE layer and block convention/creation.