Problem is we need/want a DM that can do it all (pass, tackle, quick, athletic and covers ground, good in the air etc.) when they are like unicorns.
People suggest players players all the time but they are all completely different. Some are great athletic tackling machines, but have terrible passing, Or they are great at playing out from the back and starting attacks but not strong and robust enough defensively etc.
Like GB mentioned, We could find another DM that is more of a 'pure' DM than Bissouma or Bentancur but the way we play with full backs pushing up so much would still leave him exposed. It would be better if one went and the other stayed at least but what do I know, I assume Ange has a plan and we are either not implementing it correctly or don't have the right players yet to make it work well.