@gridsquaresMy main suggestions to improve tanks.
1. APS. It would alleviate some of the issues the tank faces with more threats than ever.
2. Increase splash damage on main shell. You need to run the main shell to compete with other tanks but you then have experienced infantry who mock you as they can hide behind the tiniest piece of cover safe in the knowledge that only a direct hit will stop them with minimal to no splash damage to worry them as they easily reduce your health to 25% with their 3 M5 rockets leaving your tank vulnerable to any other enemy in the vicinity.
3. Increase tanks turret elevation and turning speed to give a fighting chance against attack choppers.
To sum up, just go and copy BF4, it's not like Dice have to invent anything new!