I don't believe that speed always disrupts a defense, but in some cases it most definitely does. I am not going to go back into all the data that was used in the study you presented and have the same discussion all over again, but I didn't agree that the study used sufficient data to yield a definitive answer. That study was faulty imo. Also, it is my recollection that the study was presented to show that speed on the bases did not improve the performance of the following batters. That is not the same thing as disrupting a defense.
Even if that study proved that speed is not generally a disruptive factor, that doesn't rule it out in every case. In my experience , I have seen it be very disruptive. I think that anyone who remembers the 1967 World Series can tell you that Lou Brock was a tremendous disruptive force. Anyone who is still alive who saw Jackie Robinson run the bases in the late 1940's and early 1950's can testify how he disrupted team defense.
I think you picked the wrong example if you want to talk about traditionalist views versus nontraditionalist views. If you want to talk about traditionalist views, I believe that there is still a place in the game for the sacrifice bunt despite the fact that my father told me at age 8 all about how giving up an out negatively affected the percentages for scoring runs. I don't believe in little ball and I understand the percentages when you give up an out, but sometimes I do think that a bunt is in order. If you want to call me a traditionalist for that, fine. I guess that you believe sacrifice bunts should never happen and that the skill should not be taught.