I agree with you that it tends to be an unpopular idea on here, but I can see the sense to it, especially the way Conte's systems work. He doesn't really need players to be intelligent footballers in all positions, in certain positions he just needs them to practice the same things a million times so that when the time comes in a match, they just do those things instinctively, no decision-making required. Ok so obviously I'm over-simplifying somewhat there, but you can see the point I'm making - Conte could get the most out of Traore, despite his flaws, more so than most managers could.
In addition, given his limited playing time at both Wolves and Barca, I doubt he would expect to start every game, so I could see him being an option for the types of games where he would be most useful. (There people might think I mean the 'defensive wall' teams, but actually quite the opposite - when WE'RE being possessionally dominated and are stuck on the edge of our own box, being able to get the ball to Traore to smash us 60 yards up the pitch would be a godsend).
But as you say, it's a very unpopular opinion on here, and with so much evidence of his failure to deliver in the past, you can absolutely see why people aren't keen.