I am beyond 100% with you. That sounds like such a cool direction the game could go with. In terms of what it would mean for Reforged, I hope they stick with the core content that already exists, and then once that’s done and launched they begin working on something like this. I hope that only because they need to get people re-introduced to the foundations that are Wc3 for them to build this amazing lore tree that you’re pointing out. This is part of why Warcraft 3 was just so much better than WoW.
The sky truly was the limit for the amount of directions and nuances the story could take. I had a whole post about how the intricacies of the Undead, and the friction of Arthas becoming the Lich King and regaining much of his lost power versus the Forsaken and the roaming feral bands of Undead. These sorts of open ended story threads were utterly squandered in WoW, but I believe in an RTS format, they could really flourish!