If we play with a double pivot, we dont necessarily need a DM. Two defensively responsible box-to-box midfielders will be fine. A duo of midfielders like Kessie, Bissouma, Phillips and Tchouameni would be sufficient. You use them as 2 pistons.
DM is more a need if you play a single pivot, with 2 creative midfielders in front.
Our problem is we have box-to-box midfielders that are terrible at defending. And our defensive tactics and organization are inexistant, with our front 4 being absolutely useless (Bruno, Rashford, Greenwood, Ronaldo).
Bayern Munich is the prime example of the double pivot in a 4231, using two competent CMs and not a DM specialist. Their 2020 CL winning starting XI constantly featured Thiago and Goretzka, neither being pure DM like Rice. Then there is Muller that is not even a real no. 10, that contributed defensively, which our dear Bruno doesnt do at all.