I think we really need to reconsider the 4-2-3-1
It's a nightmare model to try to play possession or control game as you are almost always giving up numerical advantage in the center (at best in our model the two, plus 1 of the 3 in front are actually holding the CM position, this constantly goes up against 4 or 5 from opposition)
It worked well under Poch when we had Dier, Dembele and Dele just in front of them. 3 six foot plus players