Full season cars run 0 ballast in the last race of the season for Super GT as well, it's more an issue of not having your finale kneecapped by contenders carrying too much ballast to be competitive.
As well in WEC you get extra points for the longer races, so even if it wasn't Le Mans specifically people would be throwing the preceding 6 hour race to run lighter. Although in the current schedule you'd still be looking at Shanghai that way because Sebring has extra points.
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