It's not an experiment. It's him turning a club that have been a fairly defensive counter-attacking side for years, into an attacking, possession based side. It's funny though that people talk about Kante as a DM. You know how many Premier League games Kante has played as a DM? 6. Those were the 6 first games of Conte, where we were fairly shit. At Leicester, Drinkwater was the defensive midfielder, not Kante. Kante has never been a DM, and the fact so many people think that he is, says quite a bit about the level of understanding people have about Sarri and his tactics.
I put myself in that same bracket by the way, I don't pretend I understand the intricacies of what he's doing, but this idea that he's just playing people out of position, and should fall back on the same tactics the club used to use is deeply flawed. The players don't want that (see David Luiz interview today), the club don't want that, and all it would do is throw away the progress Sarri has made over the last 6 months and achieve nothing. Just like Pep and Klopp both needed a season to settle in, so does Sarri. It's way too early to be saying his tactics don't work, when he's only had half a season and one transfer window (and even then he didn't arrive at the club until late in pre-season).