Well, the Maatsen situation was more broadly to do with his insistence not to revert back to a 343 even though the squad make up at times made this the most obvious fit. Instead we wasted a year of Colwills development playing him at LB, Maatsen never got a chance, Caicedo and Enzo got played into the ground/exposed as Gallagher should've never left the pivot to help them out, while he could then play to his strengths and arrive later to the attacking phases rather than instigate them. The there was is refusal to drop Disaster, Sanchez, Sterling and Caicedo at times - even for there own sakes.
Then there are his:
A) substitutions, which to this day are still purely reactive rather than proactive
B) his tactics if the game gets tight where he decides to play the game out for a draw even if we aren't set up for it and he insteads tells the teams to drop 10 yards and get tighter together whilst leaving positional clowns like Disaster and Caicedo (particularly up until two months ago) on the pitch.
For me, beating up Everton, West Ham and Tottenham- whilst in poor form - isn't enough for me after what I have witnessed all season.
That isn't to say he should be sacked, it is just that I am still seriously unconvinced and will need to see more evidence/see who is a actual possible replacement.