The third shot drop? Nope, a shot you need, but not the most important. The Dink - Not even close. Got to be the serve. That would be my pick. Missed your serve? Not great but not the end of the world. Missed your return? OUCH! That's a point to the opponent (basically 10% of what they need to win).The most important shot in pickleball - The return of serve.
On your return of serve, give yourself a reasonable margin of error. It will reduce your unforced errors and improve your results.
For more on this click on the two links below for tips from the pros on why the return is so important and how to improve your margin for error.