The squad presets are a bit of a cumbersome way to do it. If I have different BR lineups for the same faction, allow me to have a lineup for all 4 directly changeable in the main screen if I choose so.
The benefit for you guys is that veteran players might be available to even more different BR-faction combinations for MM.
The additional benefit to us is that changing out squad equipment between BRs becomes faster, as you dont need to rotate back to the squad selector view every time.