Have read a bit of history on the evolution of tip types and sizes. Short version seems to be that Taper Tip was originally designed to help the fixing/gluing process, back when the glues available weren't that good. Parallel tip seems to be more versatile and cheaper to manufacture. Apparently, all steel shafts start out parallel tipped and are rolled again to form the Taper tip. A strong attachment to the DG shafts by the Pros was also cited as a reason why Taper Tip has persevered for so long.
So what are the Pros and cons? Would we be better off if all manufacturers moved to the .370 Parallel as the standard?