Very well said. Two cases in point:
1) Game 5, 2004 ALCS. In the 14th, Ortiz gets a "clutch" hit by dumping a very soft single into CF, scoring Damon and winning the game. If he hits it a little harder, Williams probably catches it and they move on to the 15th. Instead, the Sox live another day and on to history.
2) Game 7, 1962 World Series. Bottom of the 9th, men on 2nd and 3rd, Willie McCovey rips a line drive right at Bobby Richardson and the Evil Empire wins again. If that ball is 3-4 feet to the right, left or higher, it's a two run single and the Giants are the champs. McCovey wasn't "clutch" in that situation.
The results were different, but did either of them really fail?
We like to remember the times an Ortiz came up with a "clutch" hit to win or tie a game. We forget all the times he failed in those situations.