I don't agree that Pogba is a well rounded player. He is poor defensively and I never quite trust him picking the ball up from deep as he has form for giving it away unnecessarily in a dangerous area. As good as he is offensively, as others have mentioned in this thread, he tends to tread on Bruno's toes, or at least they don't really compliment one another. If we are looking to be more attacking in a 433 this year, then a b2b midfielder would give us a better shape in my opinion. So we'd have Fred or McTom, b2b, Bruno, Sancho, Cavani, Rashford/Greenwood.
Ideally we upgrade on Fred/McTom as well, but if we end up with Sancho, Varane + a solid b2b midfielder I don't think anyone could complain. Camavinga maybe?
As midfielder, he was quite well rounded. But he has been inconsistent for us and took too much risk at the back at times which makes his defending looks questionable.
During the peak of his power, he does have the kind of stats no other midfielders could match. For example:
Juventus 15-16: 2.9 dribble, 1.5 key pass, 2.2 tackle, 1.5 interception, 1.8 ariels, 7.81 avg rating
France 16 Euro: 2 dribble, 1.7 key pass, 2.4 tackle, 1.4 interception 1.4 ariels, 7.46 avg rating
France 18 WC: 1.3 dribble, 1.5 key pass, 2.2 tackle, 1 interception, 3.3 ariels, 7.49 avg rating
France 21 Euro: 2.3 dribble, 2 key pass, 2 tackle, 1 interception, 1.3 ariels, 7.64 avg rating
And lets compare him with best attacking midfielder (De Bruyne, Modric), and some of the best DM (Rice, Kante, Joginho, De Jong) from last season:
De Bruyne 20-21: 1.9 dribble, 3.2 key pass, 1.4 tackle, 0.4 interception, 0.2 Ariels, 7.65 avg rating
Rice 20-21: 0.9 dribble, 0.7 key pass, 1.8 tackle, 1.8 interception, 1.4 Ariels, 7.01 avg rating
Kante 20-21: 0.9 dribble, 0.7 key pass, 2.6 tackle, 2.2 interception, 0.6 Ariels, 6.86 avg rating
Joginho 20-21: 0.6 dribble, 0.9 key pass, 2 tackle, 1.4 interception, 0.6 Ariels, 6.88 avg rating
Modric 20-21: 1.3 dribble, 1.4 key pass, 1.1 tackle, 1.4 interception, 0.5 Ariels, 7.15 avg rating
De Jong 20-21: 1.6 dribbler, 1.3 key pass, 1.2 tackle, 1 interception, 1.1 Ariels, 7.13 avg rating
Its quite clear Pogba is by far more well rounded than any of them. Replace him (his peak form) would be near impossible. But we can have players to share his role. I agree Camavinga would be a good buy as his "defensive" replacement, given that we already have Sancho in our team to replace his "attacking/playmaking" role.