Something that really stands out with Mainoo in this team is the gulf in technical capacity and competence between him and everyone orbiting him.
It is said that he is not doing enough off the ball work and is being too quiet with it being put down to age and inexperience why this is so. If you study these games, you will see that it's not that at all; there is a real fear and incapability of passing to him through lines or when he is even moderately surrounded. Our defenders and midfielders need a lot more space provided to even feel confident enough to thread anything through any lines, and more often than not, even with Mainoo decently open, they won't back themselves to hit the mark and will avoid passing to him entirely.
I know some wish to compare Mainoo to Scholes, but usually it's with regard to needing to have an expansive passing range like the ginger sage, but one of the most understated and underrated skills Scholes had was catering for the technical level of those around him. He had the games of everyone he played with downloaded. What kind of passes they give, what kind of passes they could deliver, how they would deliver them; how to weight passes in relation to who he is sending them to, but most importantly in relation to what I'm writing is that Scholes would move in anticipation for the player who was on the ball. The less passing competence they had, the more he would sprint 5-10 yards into the vastest amount of space he could find to make the pass to him as easy and simple as possible for them in accordance with their ability not his. Modric is a modern day master of this, and again, of all his skills and abilities, this is something that goes under the radar and is barely spoken about.
The above separates good movement from what might fairly be called all-time level movement; it's not something all midfielders have the time or ability to concern themselves with - being of a far higher technical level than those around you, but still catering for their game is really the pinnacle of midfield off the ball movement, for me. It's one thing to be amazing on the ball and when it comes to you, but to even give a second thought to those who are nowhere near that level is special - trying to prevent them from drowning or being embarrassed by understatedly aiding them continually is something that makes a players player and someone coaches use as a gold standard. That nuance is something that won't even be talked about in most plaudits for those kind of players, but will have them appreciated forever more by all those whose life they made so much easier than it could have been.
Along these lines, an extreme example of the opposite used to be Messi, who was renowned for playing walking football and demanding the ball at all times no matter where he was or how tightly marked. Not often did he aid the passer by coming short or making the bursts into space referred to above, and whilst that was fine for club, with Busquets, Xavi and Iniesta being able to thread passes through the eye of a needle all game, all season, it really made life harder than needs be at international level where the same walking style and requests for the ball in spaces those teammates couldn't hit led to turnovers and awkward disconnects. Messi worked on that side of his game in his elder years and became much more considerate to the less able, better catering to what they couldn't do rather than what they could.
Mainoo isn't Messi nor Scholes or Modric, but what he is in need of learning is that the ample movement into space he's currently executing, needs to be even larger, better, quicker and considerate of who is on the ball and their own competence with it. It's really paramount to get a midfield together where these micro actions are fewer and farther between because the technical acumen of the unit is already so high they can hit marks safely and accurately with the correct weight on the pass, but in the interim, working with the less able, those bursts into as open an area as possible are the difference between them taking on the attempt to pass to him or them instead continuing to bypass him because they can't back themselves to hit the mark.
The best solution is to get in players who this becomes a redundancy for, but for so long as we don't have those players, it's something Mainoo is going to have to take on board if he wants to optimise teammates. Right now, the guy is an island and we really need the technical efficiency of the team dragged up from the dredges - I think only Martinez in the whole defence and midfield can hit sharp short passes superfluously and continually and it's a real shame those two haven't had minutes together to put that to the test. We need CB's and CM's who can do this stuff in their sleep - in this day and age, it's not particularly special, yet we are nowhere to be seen on that kind of passing spectrum. We have a lot to sort out this summer, but for me, this is the biggest priority of all - the movement and space Mainoo provides should be ample enough and the fact it isn't, should tell those who are in charge of recruitment how much work they've got on their hands.