I don't understand what "philosophy" has to do, with a game which is mainly brute force. Because computers win, and see checkmates of 20 more moves in seconds, because they can look for many more moves than before. Now, with the Nalimov tablebases we know instantly the truth/result about endgames up to 5-6 pieces.
Maybe the question you should ask yourself is: why chessplayers believed strategy exist, when computers can win 99% of chess players with just a brute force algorythm.
I've been playing online chess within the range of 1200-1800 for years! That said, most players i've come across spot tactics very quickly, but they usually play mechanically!
Even in online master games, positional thinking is not well-developed i think...
Do i witness the end of philosophy in the modern world or something?