Back in patch 0.7.0, you could only load 5 rounds of APCR into an IS-7; that was the hard limit. You couldn't buy it for credits, and you had to spend gold to get it. When the 0.7.0 server came back, I never had a game where it felt like my armor didn't matter because gold was just being shot through it.
You also had 7 arty on each team but we'll ignore that for right now.
Personally I do feel like there still should be that hard cap that is assigned to every tank in the game tier 4 and above, and just remove premium ammo from tiers 3 and below completely. Obviously the limit would be more generous than 5 rounds in today's game, because there are a lot more tanks that have a lot of armor.
I'd love to know what you guys think about gold ammo usage, and if it should change.