Light tanks weren't touched. The changes are still intact and they remain nerfed, as they should have been.
Light car buffs were reverted because we don't want them to replace the current OP light tanks and form a new cheesy meta.
PTRS was removed because we had people starting 100 topics on the subject on a daily basis and 1,000,0000 posts on the WBP threads. It was an odd change and didn't help the SU or the game as a whole. PTRS cons could be a possibility in the future.
And instead of attacking the balance team with one word posts, you can always build your own balance mod and prove your superior solutions.
https://www.coh2.org/topic/58159/relic-have-an-awesome-idea-for-balance-create-a-mod
I commend Smith for his persistence and hard work.