I think too many people are trying to get an edge in their preferred playstyle, game mode, and/or faction, and not enough people are looking at this game comprehensively.
I don't think many people even understand what a meta game is in the first place, let alone what state coh2 meta is in.
Two things create meta.
1. Units that force a certain playstyle from your opponent (ex. KT forces the enemy to build TDs since it wipes everything else, comet rolled over everything and forced enemy into Panthers)
2. Units that are chosen due to 1. (Ex. Enemy has masses of TDs and indirect fire and the only way I can deal with them (as ostheer) is by using an elephant. Enemy has loads of terminator infantry, therefore I'll need indirect fire to counter blob.
In my opinion, the units in the first category should be considered for nerfs, and the units in the second category should either be left alone, buffed, or created (if a certain faction has no counter to a certain type 1 unit).
Im not saying type two units shouldn't ever be nerfed, or type 1 buffed, I'm just saying this is the order of approach to changes that should be considered.
This means that if a faction is struggling against a type 2 unit, they should be able to deal with it by changing their play style and army builds which would negate it's usefulness. This is how it's done in 1s and 2s but this starts to fall apart in 4s since you will be facing counters to every army build.
The solution to this problem is to buff the type 2 units slightly and nerf the type 1 units.
Summary:
All in all , counters to type 1 units (aka type 2 units) SHOULD NOT BE NERFED because then you won't have an answer to enemy army composition. Type 1 units should be held in check by making sure they have a weaknesses and reliable counters.
I hope this makes sense.