Varane and Kimpembe just aren't that good. The difference was a fit Umtiti. If you look at their 2018 squad, they also had Matuidi. Not as technically gifted as their other players, but someone who is very determined to do what it takes.
The mistake Deschamps made was still trying to play the same lousy negative football with Benzema and Rabiot on the pitch (fielding Rabiot is always a mistake btw). If you're going to play with these players, you have to attack consistently and go for 4-5 goals instead of leaning back. If he'd done that yesterday, they would have comfortably put Switzerland aside.
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Loved that Sommer thought they would somehow allow Mbappé to retake the penalty. As if he did something wrong by eliminating France.