Chess is just a game, with rigidly defined rules and win conditions. Real life is a fuzzy mix of ambiguous rules that may not apply and can be changed at any point, without any permanent win conditions.

I'm not convinced that it's impossible for computer to get there, but I don't see how they could be universally competitive with humans without either handicapping the humans into a constrained environment or having generalized AI, which we don't seem particularly close to.