Here is where I am coming from. Some years back, I discussed splits with Manny Bragg. Manny said that earlier in his career, he was interested in faster splits, and Frank Garcia told him, flat out, that if you are shooting splits faster than .25 in a match, the gun is shooting you, rather than you shooting the gun. If you consider that with minor scoring, a C is equal to .20 seconds on a very high, 10 hit factor stage, and .40 seconds on a more typical 5 hit factor stage, you can see that saving .02-.04 on a split is a tough way to pick up score. Different source, Robbie Leatham, told me his most important piece of USPSA advice is to shoot the close targets slow and the far targets fast. Why, because an A at 3 yards has the same score as an A at 35 yards. Think how often you see someone at a match go blam, blam, blam on 3 yards targets, getting a bunch of C.s. However, many shots in a match are more like .25-.35 speed, and being able to shoot an A in .30 instead of .50 would seem to provide more return in total score.
Different game, but Darryl would tell you that in real life defensive shooting, fast splits bring with them more downside than upside.
I have no problem with shooting faster splits, and along with draws and reloads, they are our metrics. However, I would not lose sleep because a newer shooter is running .26 splits on a Bill drill. Looking at the Gabe White testing standards, he has .25 as the standard at the light pin, intermediate level (and .20 at the turbo level, reinforcing what Clusterfrack is saying about what is a good goal to get to eventually).
As a personal note, I have never found the shoot in the berm practice to work for me, and routinely shoot slower splits when doing it, than shooting at the target. Probably something about tension, as I often shoot my fastest splits when not trying to.