I think there needs to be a massive reconsideration on how cheap all howitzers are on price. The price was lowered originally because there were counters like jaeger armor in doctrines that were picked every game. Those counters are not around anymore. On top of that, 400M and 50F is roughly 2 minutes of time designated to 1 unit in terms of income, whereas amassing 200MU + recon can take at minimum 4 minutes of income in munitions.
That's not how it works. Fuel & especially manpower are more valuable than ammo.
Who cares that your enemy needed to wait & invest all his ammo when you crippled your manpower economy, hence have 20 army size at some point while the enemy has 70