I personally think that tank progression is kinda stale and would like to suggest the following:
Instead of unlocking new tanks in the campaign, let the player unlock 2 more tank squads. Each tank squads has their own specializations and benefits:
Starter: Light tanks
First unlock: Medium tanks
Second unlock: Tank destroyers
Light tanks would be able to cap points but only count as a single soldier when all tank crew are inside the tank.
Medium tanks would be able to carry an ammunition resupply point on their back, allowing infantry to restock their guns like with the engineer building.
Tank destroyers would be able to carry an explosives resupply point, allowing soldiers to replenish 1 grenade of the type they had in the explosive slot when used, per tank/life.
Instead of weapon upgrades in the green upgrade tab, we would have tanks, costing 3-10 upgrade points to unlock. If the developers desire they could also lock shells there (for example, HE/HEAT rounds or HVAP/APCR)
For the tanks to unlock, I suggest the following:
Germany light:
Pz35t > Pz38t > PZ2 (no HVAP)
Russia light:
T-26 > BT-7 > T-60
German medium:
Pz3E > Pz4C/D (no HEAT) > Pz4J (short 50mm)
Russian medium:
T-26-4 > T-28 > T-28 mod1940
German TD:
Panzerjäger 1 > Stug A
Russian TD:
Su-76 > ZiS-30
Comments:
Yes, I did put a Russian light into the medium line. There are very few Russian mediums to choose from: only the T-28 and variants, and the T-34, which would be OP. Instead, I opted for the 76mm T-26 which can lob HE, as well as the T-28 mod1940 (the only vehicle not represented in war thunder as of now) which has a longer 76mm barrel similar to the T-35.
Any suggestions are welcome