No, it doesn´t prove your point.
"I'm telling you here and now that weapon upgrade will never happened because Relic took the commander approach to implement this so you don't have access to good late game Cons and Elite infantry at the same time. "
If your point was: you can´t have Elite infantry and Tanks...Guard Motor and Shock Rifle...
Your point should be: you can´t have escalable conscripts, Elite infantry AND tanks...well yes.
That's the only feature that's good about these doctrines. They don't come with any kind of heavy tank or different unit that will make them stand out and that's a balancing factor itself. In fact they are so good I forgot they existed.