Problem with Pogba is he's a mercurial, high risk, creative player before he's an efficient, simplistic primary passer/controller - but he's tasked with and judged on doing everything. A paradox.
Mercurial players have off days, but can turn a cold performance around in one moment with a jawdropping pass, skill or goal. It's up to the true primary passers a little deeper to keep the game ticking & flowing in earlier phases, to keep United as the dominant possession team, to keep getting Pogba on the ball between the lines/on that left half space, letting him drive in transition, link it, try things, etc. - You basically carry Pogba on his off-day and in return, you get X-factor & a gamebreaker. And when he's on it, you have a player who contributes to every phase of play and is simply untouchable. Issue is, we only have the environment for him to flourish in the latter scenario, not the former. Pirlo & Vidal compensated for him at Juve. If he was off it, they still controlled games & gave him the platform to be the difference maker. We don't have that. He's expected to be the 6, 8 & 8.5/10.