I disagree. I think it's an example of a good asymmetrical balance.
If you go T1 you aren't *denied* AT guns. You're basically gambling that you can beat out the enemy with superior firepower and inferior numbers. You give up a fast. AT gun and in return you get AT infantry that can hold their own against LVs. And then from there you supplement those troops with tanks that pick up the slack in AT and AI.
OR if you realize that you're not going to ne able to do that you still get the option to build T2 and get an AT gun.
That's a 1v1 scenario. In other game modes, sovs that go penal find their one AT unit facing early p4's with no AT gun support