You don't need an AEC if OKW skips their light vehicles to rush a tank. If they do get light vehicles, the AEC + its tech is cheaper (20 fuel more for OKW Mechanized vs 15 fuel for AEC unlock and the AEC is 60 fuel compared to 70 for the Puma).
Even if you go for every side tech (except AEC), that is 35 + 15 + 10 + 30 + 115 + 110 - 20 = 295 fuel for a Cromwell, which is less than OKW need for their medium tank (310). So once again, the UKF still has faster tank tech timing in any scenario.
Brits don't need Brens on Tommies to fight STG44 Volksgrenadiers either, they don't need grenades. See video below. They do fine just with Bolster. Besides Bolster, Brit side tech is all optional at the moment.
Right, but you're also paying extra popcap and MP compared to volks. And I could find a great deal of replays where OKW players don't even bother with StG upgrade and instead prioritize inc nades to win early engagements vs Tommy to snowball with luch and puma (later command panther).
Should we nerf incendiary nade to force them into having to use StG? It's the same logic you are using, and plenty of top players like luvnest have highlighted this issue with volks making the use of greencover redundant.
If you're gonna nerf core Tommy DPS you're gonna have to make it cheaper with the MP drain. There's already been power creep with conscript, pgren and gren buffs, volks still the best cost effective and versatile inf (sandbags, Faust, AI upgrade, building clearance) inf the game.
There's no doubt they're strong and over preforming in AI engagements, but you have to look at the broader balance picture rather than vacuum tests.
You mention yourself you want to reduce Tommy DPS to make units in green cover or buildings stronger, but just what other tools to ukf have apart from section spam? Wasp is fragile and mortar pit is useless