This is an interesting point from an Enlisted perspective.
When the campaigns were all around 15 levels then the equipment and vehicle disparity was not too great from the starting point, and so an MM wasn’t really necessary.
With the stretch of the campaigns out to lv 30, and more importantly the subtle power creep associated not only with more capable vehicles, but also with the class bonus increments from first to second and in some Campaigns the third class of riflemen, assaulters, snipers etc, one could argue that there is a growing case for some sort of MM.
So where which breakpoints in advancement would you anchor this on?
If you notice the Campaign advancement for the different nations across the available campaigns is also not technically balanced properly per progression level.
Whilst there is a generic level of parity in the advancement, from the perspective of the “type” of squads available - ie rifle, assaullt, engineer… there is no equivalent parity in the equipment available to those squads.
Quite a few of the weapon systems are historically accurate, whilst others are gameisms, esoteric selections to abstract some player choices out of the historical context. These variables create associated capability spikes across the progress of the campaign.
This see saw means that different players who are different stages of their campaign progression will introduce a level of friction (capability disparity) into each game.
This is consistent with these types of games, and WT as an exemplar which introduces a +1/-1 BR spread on a 0.3 / 0.4 based increment system (ie a spread of 3 possible vehicle BRs being dragged into a game) as part of the MM
So in conclusion I think this is intentional, and so I don’t think you will see an MM per se. You can chew through the initial levels quite quickly so there would be some slow down from level 7-9 onwards, and so realistically you currently have about 21-22 levels of equipment spread within which there is probably about 2 actual capability step ups in terms of troops and vehicles.
Perhaps too early at this stage for an MM, but its probably also limited by the size of the playerbase as well. So I don’t think you’ll see too much player separation at this time.