I don't see it that way. It's much better to learn from the entire body of evidence vs. one's painful experiences. The fact that a painful experience tends to drive a learning home in a very effective manner does not change this because the learning might not be a valid one just because it turned out that way one time.
Investors have a tendency to put more weight on learning events that have large impacts on their own finances but, from a first principles perspective, this is not wise. Considering all the evidence equally will result in better performance than weighing personal experiences disproportionally.
That said, I do think the conclusion that tax considerations tend to be given too much weight is true. Tax consequences do need to be considered but they shouldn't be given more weight than they deserve. The reason investors tend to break this rule is because the tax consequences of a decision tends to be very visible (and sometimes a certainty) while the result of an investment decision tend to be unknowable until some time has passed. This leads investors to put too much weight on the tax considerations. It's often better to make the investment and pay the taxes. It really depends upon the level of conviction. This is where investors tend to over-estimate their ability in the short-term. Short-term price movements are largely unknowable (at least with a high level of certainty) and so tax considerations should rightly prevail. But longer-term decisions need to give less weight to the tax considerations.
Summed up and generalized, a trader should trade, taxes be damned, and a an investor should hold. Because holding automatically minimizes taxes. Taken to the final conclusion: Don't trade, hold!