IMO, nothing wrong with 3-5-2 formation. Its just we don't have right player at right position, especially for asamoah and licht which are forced to play not in their native role. Also, pirlo's position sometimes kinda useless and can be substituted with a playmaker, second striker or even a striker with 3-4-1-2 or 3-4-3 formation.
If Conte is insisting on using 3-5-2, Juve should buy WB with Maicon or Marcelo explosive style. Isla actually suits this role, but he seems to be forgetting how he used to play football in Udinese. Also a good creative midfielder or playmaker to increase the options and allow tactical alternatives.
Although I agree, current trend in football is using only 1 striker. To fully utilize 4-3-3, we need at least 2 winger and one left full-back. I know Vucinic, Tevez, and Gio can play winger position, but I doubt it will be better than Asamoah and Licht play in Wing Back.
Anyway, we were poor in both games (by our standard) and deserved to loose. I'm not blaming anyone here, especially Conte. He has done an incredible job in Juve. There is still more time for him to learn from his experience and bring more glory to us especially in Europe.
Now lets forget this and prepare to celebrate 32 Sul Campo on Monday.