Ltheb Silverfrond said:The only time I can think of where using the lowest attacks first would be beneficial is if you fought someone with Mirror Image up. The images have a very low AC, so you could rapidly remove them without wasting your good attacks.
It's also useful if you're intending to make a special attack. At 16+ level, your fourth attack probably won't get through your opponent's armor. So it doesn't cost much to make that attack a trip attempt, especially if you don't provoke an AoO. If you succeed at a trip, you now get +4 on your attacks that are likely to get through the armor. And since the trip is a touch attack, you've got a much better chance of succeeding with it.