a chess engine are merely stored up possibilities of several ways the game of chess can go, there pros and cons to each way, and ways to nullify the strategic and tactical advantages and disadvantages that arise in any direction,  it is for the human player to choose the direction that he wishes to proceed, use the engine to refine your practical strategy that suits you, you may pick up some stuff that you over looked, but end of the day when you at the board analyse the board choose a move in which you have a proper follow through by logic of tactical exploitation or reasoning of strategic evaluation, place faith in the capability of the human mind it is not obsolete, don't sit at the chess board asking what did the computer do, look at the board analyse the board, use the logic and reasoning of the human mind, it is still the most practical way to play chess