I can't think of a time that I could say with 100% certainty that color was the main factor in catching or not catching bass. I can say that with at least 10 other sport fish species, both fresh and salt water I have had numerous times, when it was by far the biggest factor, and some situations, where it was the only significant factor. I think any predator on land or water that can see color will use that color vision to their advantage.
If a person were to spend a day shooting orange clay pigeons, that were extremely fast and hard to hit but was told, do not shoot any tennis balls launched out of the say thrower. After and hour of shooting orange clays they throw out an orange tennis ball the same size and at the same speed. I would bet that 9 out of ten people will shoot the tennis ball. If the ball had been yellow, I would bet that 9 out of 10 would not shoot. If the clays were all different colors, I'm sure that the shooter would try and key in on the shape and flight characteristics, and color would not matter at all. I'm also certain, that it would be more difficult to spot the shape difference, making the person delay his shot, causing the hit percentage to go down. Translated to the fish, he fails to catch his prey more often. If the tennis balls were twice the size and bounced on the ground rather than thrown in the air, than of course color would not matter at all. ( Crayfish on the bottom as apposed to bait fish near the surface). My point being, it is hard for a bass to catch his food. He will use any of many methods to identify and catch his prey. Sometimes it will be action, the next time it will be size, and yes there will be times it will be color. If you think color doesn't matter, it's not that it doesn't matter, you just haven't come across the situation where it does yet.