I mean, the way I look at it, it will only really change the first game of the playoffs. If you can get through that first game with iffy GS for new players then you can train it back to a good competitive level for the big playoff games.
And if you can manage to buy players before the training update before the final regular season game, that gives you an extra training update to recover GS. (Admittedly, that was this morning so this isn't useful *now* per se, but as a general strategy).