On formations, my view is that its a number. Teams that play the same formation, can play them extremely differently. Formations love to be talked about by armchair coaches like ourselves.
I like coaches that pick the formation based on the strengths of the key players. This is why I like Conte as a coach. He chose to play 3 accross the middle because of Pirlo (even though he had a natural affinity for the 424 or 442). He then chose to play a back 3 because he liked how Bonucci can bring the ball forward from defence and that he had Lichsteiner who can tear up and down the right flank. He abandoned the 433 once Pepe was not around.
So it all makes sense. If Conte had players like Robben and Ribery, then I have no doubt he would switch systems. The key is to acquire players who can make a difference first and foremost. The best players can always adapt slightly - and then pick the formation that works.
My biggest concern, tactically, is Pirlo. Pirlo has no direct replacement (not at Juve, not in Italy, and possibly in Europe) - he has very distinct characteristics. The Juve system is BUILT around him - more than any player.
So, rather than trying to replace Pirlo or work on a Pirlo understudy, Conte should be thinking of what a Pirloless system will look like. This throws up many possibilities INCLUDING (but not excluding the 352) a look at 4231 or 4321 or systems that make the most out of the characteristics offered by players like Pogba for instance.