My idea for a rework using the new merged system would be something like a 3 tier system.
For example, a average Invasion has 5 Objectives, change that into 3 Objectives and increase radius and time to cap.
With each tier more advanced squads and tanks will be available as the game progresses rather than at the beginning. Or if you would like maybe like a BR cap per tier. so someone could maybe bring a heavy tank in the beginning but opts to have less than optimal infantry squads.
Also I would love the idea of the map 2x in size, and increasing the Objective control area to be a larger area.
to further slow down the game.
Tier 1 (For 1st Objective)
2-3 Squads
1 Tank/Plane
Tier 2 (For 2nd Objective)
2-4 Squads
2 Tank/Plane
Tier 3 (For 3rd Objective)
2-4 Squads
2 Tank/Plane