TwoSix
Everyone's literal second-favorite poster
I think there's some room in the middle, here. I mean, a specialized sword technique is something I would generally be amenable to a PC learning. A powerful technique might take months or years of in-game time and spending multiple levels on it, though.Yeah, we're just too far apart on this one to come to any sort of mutual agreement. I think the idea that PCs are entitled to be able to learn spells or techniques used by NPCs is just silly. First of all, abilities that exist to make a single fight more interesting are almost certainly not balanced against PC abilities which are forever. Second, as I have said, wonder is a huge part of play for me as a GM and that means PCs encountering stuff they have never seen before and barely comprehend -- and that they certainly can't have.
Some magical abilities might just be due to the inherent nature of the creature in question, though, and those are typically well beyond the ability of a PC to acquire. Some evil cultist might be empowered by a demon bound to his soul to cast a specialized spell, that circumstance can easily be something that's not replicable by the PCs.