This is interesting, and I have a more mathematical way of thinking about this. If we were somehow able to segment evolutionary pressures, and normalize their

This is interesting, and I have a more mathematical way of thinking about this. If we were somehow able to segment evolutionary pressures, and normalize their values such that they sum to one, I'd hypothesize that as the average evolutionary pressure goes to zero (meaning high number of evolutionary pressures that are generally uniformly distributed), then this author's hypothesis is true. But as the average evolutionary pressure grows (fewer pressures, or highly skewed distribution of pressures), I imagine it would lead to VERY different looking life. I'd also hypothesize that as the average value increases, it leads to system instability.