The clock is just as much a part of the game as the board and pieces, and losing because of time-trouble is no different to losing because of weak play -- it's still a zero on the score-sheet.
While it is a cause for regret that Fischer did not continue to produce scintillating games, he perhaps had a greater impact on chess than any other twentieth century player
The main line of the Yugoslav Attack has become just too vast for most players to study in depth, and anyone intending to venture into such tricky waters needs to have an intimate knowledge of all the hidden reefs.