Obviously different methods are working well for most. So IMHO it boils down to your combination of parts and preferance. You can get away with a lot when using solid lifters and low spring pressures and modest duration. Sounds to me like those pro stock cams are quite rigid and can also tolerate some deviation. I understand they run less duration that most would think.
My deal is a stock size cam core with a .510 lobe on it, which limits the base circle. So it flexes, and the ramps are 30 degrees (yep!) Long on each side of the lobe before reaching the .050 lift point. Due to the profile and ramps Jones said no more than .002 lash change in either direction. That and needing to keep an eye out for valvetrain trouble forces me to be as accurate as possible.
One question- what do the cam companies say is the proper "feel" for setting lash? I shoot for a modest drag, light enough that i can't feel anything with a .001 smaller gauge.