Pogba and Kante rarely actually played in a midfield two, at least around that WC period they were so successful. A while ago I checked out all the games over roughly a three year period and they only played in a proper two-man midfield four times, all against very weak teams. The rest of the time they had another hard-working central midfielder in there with them, sometimes played in the midfield and sometimes played on the wing (but obviously helping out the midfield a lot more than a normal winger). It was also noticeable that in the games where Pogba was injured or rested, France were much more likely to play a proper two man midfield with two attacking wingers.
So even France, in the international stage where the intensity is much lower, and in a team that normally had a much bigger talent gap between them and the opposition than what you find in club football, didn't play Pogba in a two man midfield very often. I think they started doing it a little more often later on, but still used a third midfielder in there on a regular basis.