This is one of those threads that I usually try to steer away from-just not often enough. Remember that the thread started was dealing with D2, stainless steel, and other complex alloys and not something as relatively simple as even 52100. With some alloys, as indicated by their data sheets, cryo or even just cold treatment does make an improvement. Other steels you're just making cold. The formation of eta-carbides and their significance seems to be a area that is still under research and discussion.
As far as people putting their garbage out there, remember it goes both ways. I get frustrated at people who don't have the ability to isolate and test the variables involved reject decades of metallurgical science for their own pet theories and they get tired of me quoting Verhoeven and other authors of books on metallurgy. We just need to try real hard and treat each other with respect and know when to back off. Remember, never argue with an idiot. They'll drag you down to their level and beat you with experience.
Doug
Like the old saying goes:
6 to one 1/2 dozen to the other.
You guys really do need to get along better though, granted competition is there, but as a whole I would recommend showing the respect that is earned.
Nobody knows everything, that would be impossible to even think about that.