Adding a GOOD non-ped to any lurcher SHOULD add early pace and speed.
I can't see any other benefits, certainly not coat, endurance or "bone".
Im definitely not knocking whippets, pedigree or non-ped, as most will have noticed, I'm an enthusiast !
It all depends what you want and need from a dog, but adding non-ped to a line will , usually, add early pace and speed, if that's what you feel is needed.
Cheers.