I Inspired from your suggestion the following.
1- Battlegroup will include m34 and lelg available from the start, and ober after upgrade(maybe having additional side tech to enable Ober to upgrade there weapon, or lock the Ober weapon upgrades until T3 or T4 being built).
2 - Mechanized will include flak half truck and Infrared half truck from the start, and Panzer2 and Puma after upgrade.
3 - T4 will include Stuka from the start, and the P4, JP4 and Panzer after upgrade.
What is your thoughts?
I hope that balance team will take our suggestions in mind ,and make something useful from them.
not bad, the only dilemma I see tho would be the time required to research luchs and puma could mean they miss their window of opportunity to be useful