Why chess is important?
Those are noteworthy observations; however, any goal-oriented activity is likely to claim the same above-listed" benefits". Whether or not any of what you have listed is actually true is debatable; it is certainly possible, but its also quite likely not to be. It would be reassuring to think so given the time that we devote to this activity. I doubt chess sharpens critical thinking or leads to any type of measurable improvement across a broad range of skills. It is more likely that people with those skills, for whatever reason, gravitate to, or are over-represented in chess. Responsibility, like On the Origin of Species--always quoted, hardly read--is over-rated. My own thoughts are that the attributes you listed are analogous to f(x)=y; number in=number out---a person has these attributes when they start playing, chess doesn't give it to them. I value chess for the simple reason that I do, not because I believe there is something special about it.