You missed the part where brits are the only army in game with no stock indirect fire if you don't want to be rolled over by lights.
Improve flare/Pounder performance. Give them a freaking mobile mortar.
-Emplacement on 1v1 are not an issue.
-Simcity on 2v2+ are cancer on certain maps. Mortarpits by themselves are not an issue.
-Bofor + Mortar pit + Stand fast/Emplacement commander drags the game for way too much time on which you don't want to face the enemy till you get a proper army comp and you can roll over the emplacement on one swift blitz. Almost 0 interaction between armies.