I tried PBs on my GA, but found it impacted badly on the playability for me (I am not a good player). Going back to 80/20s made the guitar a lot easier to play.
So maybe the 80/20s allow Taylor to 'maximize' the playability of the guitar for the 'average' player, while still allowing it to sound great.
Also, in the UK PBs are normally a little more expensive, so there could be an economic reason for factory fitting 80/20s.
(Out of interest, on my next string change I'm going to try Polywebs, to see what they're like.)
Just to make sure we're all on the same page, Saxacat... there are 2 different issues in question in your post, but it appears you may think they are the same thing. Let me explain:
1) PB stands for Phosphor Bronze while 80/20 is a different kind of bronze string winding (anyone with better info on the difference btwn the PhosBronze(PB) and the 80/20 Bronze, jump right in!). The Elixir nano light
PB string, IMO, sounds much "darker" and "muted" than the Elixir nano light
80/20 string that comes standard on all Taylors (but they're still both Elixir NANO coated .12-.53 strings). So the first issue in question here (and the original topic of discussion on this thread) is about
Phosphor Bronze vs 80/20 Bronze and the differences in sound those 2 different strings create.
2) The 2nd issue you brought up, I think, is the difference between Elixir NANOweb coated strings and Elixir POLYweb coated strings. Totally different from the type of bronze the strings are wound with, the COATING on the Elixirs comes in 2 flavors. POLYweb is a thicker, denser coating that mutes the sound more and frays more, and the NANOweb coating is thinner, less dense, and lets more of the string sound ring through, and frays less (although it still frays). Most folks (at least that I have read and talked to) prefer the NANOs to the POLYs, and Taylor uses NANOs exclusively.
You said you, "...tried PBs on my GA, but found it impacted badly on the playability for me... Going back to the 80/20s made the guitar a lot easier to play." That's what made me think you didn't realize the 2 different topics being discussed. The difference between 80/20s and PBs should have no impact whatsoever on "playability" (at least in my own experiments with both types on my own guitars), but the difference between NANOwebs and POLYwebs could have a major impact on playability.
Hope that helps. If you already knew all of this, or if I mis-read (mis-interpreted) your post, I apologize for getting involved.
