I recently completed construction of two LP style guitars. This neck angle discussion is quite interesting to me. I bought a set of plans supposedly based on a 59' LP. A very complete 3 sheet set. The plans clearly indicated a neck angle of 3.5 degrees. Not knowing any better that is what I did. I tried to be exact. During my setup I found that proper string height put the bridge and tail stop right down to the wood. In my research I kept seeing bridges much higher than mine. I thought I had done something. More research on other LP Forums informed me that the purists like the older guitars because they have lower neck angle. The bridge resting on the wood is the most desireable position. The mystique of the older guitars is not just about the pups and pots apparently. I found this to be an issue not commonly discussed. That's my experience for what's it's worth.
