The most important tech decision is LT vs Cpt. You can change the balance of those two to make the decision more interesting but do NOT simply remove it by making tech linear.
Or you can take the wrong decision and call GG 5 minutes later. Even at very high level we see this regularly since the patch. Going Captain, just blob cuz USF can suppress you, going lieutenant, you can even make 2 Luchs, deny him enough fuel and get your Pz4 before his Sherman.
This design was making some sense when USF had the strongest early game, even the elite infantry limitation was making sense at that time, but today nop.
Moving Stuart and M15 doesn't make sense either, you're going to create a monster T1 and underlying T2. .50 offer everything Stuart doesn't have when the M15 still only need 2 shots to be dead, the Atgun will never be enough to keep it alive.
Imo, it is better to remove the stuart's engine damage ability and replace it with a suppression's one for a short time with area of effect.