I agree. Those who insist that one (reasonable) layout is sufficiently better than another enough to bother switching are suffering from confirmation bias. As

I agree. Those who insist that one (reasonable) layout is sufficiently better than another enough to bother switching are suffering from confirmation bias. As far as switching layouts in pursuit of an improvement, I imagine this depends upon the person. In my case, at least, the repeated switching forced a complete break. I could not easily fall into bad habits because I was exerting so much effort just in retraining my finger memory. In this regard it may be more of a brain hack.