We humans tend to be resistant to change. Once we find something that works at all, we are hesitant to change, even if it's for the better. Many of us, and many groups, find one thing that's effective, then camp out right there and milk it for all it's worth. Don't get me wrong, many successful businesses run this way, under the slogan "if it ain't broke, don't fix it." It takes a certain degree of humillity, disregard for appearances, and obsession with improvement to drive someone to try something new in hopes of improving what is already good. One of the things I love about SF is that, as an institution, it has the maturity to pursue improvement. For instance, there are many Pavel-authored pieces (mostly from the 90's and early 2000's) that recommend using higher rep sets of ballistics for GPP. Now we see that fewer reps and more sets (A+A) can yield better results for GPP. This doesn't make higher rep sets "bad," and it doesn't mean that we don't do high rep sets at all, it just means that we understand more about the context in which certain rep schemes are appropriate. Pavel could have simply said "Do swings until you can't feel your hands," and stuck with that. People still would have gotten good results. Thankfully, Pavel and the people he has surrounded himself with are not content with "good enough."