Interesting stuff, Eric. Makes some sense to me, although I think there are other variables involved, too, like the hardness/durability of the wood used for the bridge plate, and the stiffness/condition of the bridge pins. And I suppose long-term wear could be worse for a guitar that has frequent string changes. I had a slotted-pin (plastic, too, and original) Yamaha dread for about 35 years, and even though the bridge split between the holes (probably from me pushing the pins in too hard), it still worked fine. Even though I think it might be a good idea, I'd be afraid that a (so-called) luthier might do more harm than good when slotting a bridge.