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by Wistar 1303 days ago
Not that wikipedia is the end-all, be-all authority on double-clutching.

"While double clutching is not necessary in a vehicle that has a synchronized manual transmission, the technique can be advantageous for smoothly upshifting in order to accelerate and, when done correctly, it prevents wear on the synchronizers which normally equalize transmission input and output speeds to allow downshifting."

https://en.wikipedia.org/wiki/Double_clutching_(technique)