How do you determine where we should stop improving our abilities and increasing our capacities? In martial arts, greater strength is nothing more than greater capacity. Why imagine that there's some universal "enough" that no one should want to exceed?
Please don't put words in my mouth. I never said anything of the sort.
It's simply that all training has costs as well as benefits. All power brings with it responsibility. Not everyone seems to think about that side of the equation.