Having played as a TC a couple of times, I found that there is not a lot of definite damage output for tanks. While the minigun puts out a ton of gunfire, I found that xenos ultimately just disengage to go and heal for a minute before coming back for more. The same issue applies for the flame cannon and autocannon (not to mention that shrapnel only really seems to affect marines). Xenos take a fair bit of damage, leave to heal, and come back no worse for wear while I waste ammo and time in this fashion.
I understand the concerns regarding the use of the LTB along with the artillery module, but the tank is in serious need of definite damage output. CM13 combat heavily revolves around either stuns or extreme damage output to kill xenos and I feel that the tank currently lacks both. This would also give marines some parity with boilers and spitters.
While the ability to kill without warning might come as a bit of surprise to xenos, marines have been struggling in this regard for a very long time. Boilers are able to spit out acid clouds and railgun shots without need for logistics and very little protection. Even if a boiler dies, it is easily replaced within a matter of minutes. There are only two TCs, and if one of them dies, the tank is completely out of the round for the rest of the round.
Other marine long-range fire support assets (CAS, OB, Mortar) are either 1. Limited in nature (CAS munitions, OB shells, mortar rounds), 2. Require an insane amount of coordination to use effectively, or 3. Faces the risk of friendly fire. Xenos face none of these limitations and uses their own boilers and spitters to great effect.
This is NOT a call for xeno nerfs. This is merely a call for marines to be given some sort of parity to boilers and spitters. The ability for marines to have an independant artillery option to counter boilers will increase the feasibility for FOB defenses and counter spitters/Praes that rely on hit-run tactics that can be difficult to counter. Tanks will still be limited by logistics and the TC round limits.