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I know people like to be jar roux snobs, but there really is no point in making your own roux. I wouldn't use the dry stuff, but the wet roux in the jar is exactly the same thing that you would make on your own stove. Either way, it's just flour and oil. There is literally no difference.
I know guys who would argue there's no difference between good wine and cheap wine or nice girls and mean girls. There are people who think there's no difference between prime beef and mcdonalds, but they're all wrong.