it's because it can do things humans simply can't

Humans also can't run massive searches on deep trees or hold a huge library of opening moves in their memory.

AIs solve problems differently from humans. Software is much better at some things (from micromanagement to aimbotting to doing things quickly) and is much worse, so far, at other things. The interesting place is the edge -- where software and human capabiilties are currently of the same magnitude. That's why aimbots are boring and a machine playing Go is oh so cool.