I would agree this season was one of his better ones and certainly perfection isn't expected.
However, within the context of next season the question of Pogba remains open for a few reasons. Quite clearly the first one would be that we don't know where his future will be.
Beyond that, there are quite natural questions to be asked if he does stay. There is a clamour for a new central midfielder and this player will hopefully be bought with some plan in mind and a staying Pogba would have to feature quite heavily in that thinking. Both in terms of where we expect to play him, and also the qualities of the player we buy. Can we keep shunting Pogba around depending on the opposition, or do we try to find a formula that works for the most part? These wouldn't be questions worth posing if Pogba had deployed his talent as often as we hoped when he was bought.
If it is not the current system, what sort of system do you think would get the best out of him, and alongside who (in realistic terms)?
I would say he's been played deep because the idea was that Pogba is our most talented player so we need to get him on the ball and helping our passing, which ties in with your idea that he's our best player there - he certainly is technically. He's also not unrounded. The other viable positions are ones he is capable of and can have some good games in, but within our structure and with our personnel don't actually make much sense at all except for the odd game. Which is why I'd be interested to know how you would change things to better help him.
I think, this video can open a few more angles to have a look at the issue here.
(the video title is somewhat misleading as at least half of it is a description of the way, France set up against Germany and how that led to the performances we've seen)
I think the discussion is quite difficult because Pogba as an individual is an extremely unique and talented footballer like nobody else in world football right now. A decision to step away from him wouldn't be due to him not being good enough but to us not being able to facilitate or provide a system, he can flourish in.
Of course losing Pogba would a loss in talent and player quality. But he is unique in every sense of the word, his skillset is special, you have to compensate some traits and weaknesses. Nevertheless, I personally don't think, that Uniteds decision makers have it in them to create a system like the one described in the video - not literally but in terms of complexity, workrate, team work and preparation. And therefor it might be benefitial to say thankyou and goodbye and end this infinite struggle on how to get Pogba into the team by having a more robust, "standardized" player in there that doesn't need so much tweaking to pay back your investment.
Regarding the criticism towards Fred: I think, if we want to somehow bring Pogba into the matchday squad, than a Player with Fred's dynamism is absolutely key. His workrate is able to cover not only for Pogba but also for other team members. The match of France was quite interesting, seeing even Griezmann doing his fair share of defensive work. This is a factor that is lacking in our team, getting rid of Fred maybe increase our passing metrics by one or two percent but I have a strong feeling, that the team in total would suffer because of the missing link, that Fred provides.
We have seen how Pogba and Matic together look like. Great players but not able to hold the centre of the pitch on their own. This isn't the way forward.