Sounds to me like you and everyone else are being buffaloed,BSed,hoodwinked,............
Though I haven't used the PLR's, I've put on many packages w/ the same mechanics/characteristics of them. There not a "be all, end all" to good farriery. Every horse is different, thus the shoeing on every horse is (if only slightly) different. Everything has it's place...NBS,barefoot,heart bars,straight bars,rims,pads.........and so on. A good farrier knows when and where to use each,though trial and error, and sometimes even luck is sometimes involved.
You have concerns that should be expressed to your farrier. If he gets upset and can't justify exactly why the horse needs them, then you need a different one. If everyone at your barn gives you grief for not using PLR's on your horse and it's sound, then they have their heads in the sand.
Sounds like said farrier has a good marketing program though,PLR's are expensive.
As for the splint fracture, most likely not due to farrier.
bntnail,farrier