Collating a couple of posts I've made elsewhere on here, but the issues come down to the following factors
a.)
Full backs not providing width, which was key to Poch's system for his time at the club, meaning so much of our play gets choked up going through the middle - which is especially noticible in comparison to how The Sheikh Mansour Team and Saltypool play, as their touch distribution is almost identical to ours in it becomes a lot more centralised in the final third of the pitch - but the difference is they have width from the full backs, while our full backs appear to vanish off the face of the earth once they get near the halfway line
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b.)
Aurier not being progressive, as he was expected to be the Kyle Walker replacement bombing up from deep yet more often than not he's one of the least progressive full backs in the league, while in comparison both Danny Rose and KWP are playing the sort of progressive game we expect - although they're far from the most progressive full backs in the Premier League, as the full backs of Leicester, Saltypool, The Sheikh Mansour Team and Chelsea are all notably more progressive going forward, and a fair number of them are also more capable defensively
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c.)
A lack of an out ball on the left flank, meaning that while players on the right have Lamela getting into position to receive the ball from his teammates, on the left flank there's no out ball which means the options to our left back are either to pass it back to the centre back or try to square it into the centre instead of making a progressive pass
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So what's the solution?
If you ask the Reddit/Twitter crowd they all come to the conclusion that a new RB is the answer, as obviously they'll be more effective than Aurier has been this season (and Trippier last) - but you ask me, my suggestion is a DM is what is necessary as it's not a coincidence that our full backs were so devastating back when we were able to lock down central midfield with the Dier/Dembele or Wanyama/Dembele pivots that allowed the full backs freedom to maraud forwards, while the Winks/Ndombele/Sissoko trio simply does not lock down midfield so we're not on the front foot as much
Don't get me wrong, I'd happily swap Aurier for Atal, but only doing that won't fix the issue - the issue is we need a Kante-type player alongside Ndombele