Not to toot my own horn too much, but I actually wrote a thread on a subject quite similar to this, including the Alliance phenomenon of not being able to use most of their toys. The short version is that the ledger is so hilariously imbalanced at the present moment that if the Alliance actually used everything they had at their disposal, the war would last maybe ten minutes.
My thread, for those interested.
In any case, not much more for me to add to this. I feel like it’s pretty apparent what they’re trying to do; in the main narrative, only specific Forsaken themes are allowed to come to the fore, so that when it comes time for the inevitable civil war and raidbossing, they can more cleanly divide away the “bad guy” themes from the “good Horde” themes.