It is. i linked you 3 very powerful stuff the alliance could have used to their advantage. And btw you sidestep the info that the alliance restarted the freaking sunwell. So i think they might be able to do that again, so destroying it has little to no use
. And btw this is just stuff i know about. without doing research.
But lets turn in around the other way. The alliance also has better track record of being nice. ( since launch of WoW story)
Letting a general take home his sons body, restarting the sunwell, trying to talk to race that left to rejoin, help horde even after all that has happened, helped with the troll uprising, trying to have some peace talks.
Yes it would have been hard with the dragon soul. But so was half the bs of garrosh and he still pulled it off. And we are not talking about succesfull use of the weapons. We are talking would they.
First of even if its a very weak as you want it to be. If it fly's high above the battle at lordaron i could easy use that beam of light to torch the horde on the walls. Or on any battlefield. They could also flying high get some rogue's to drop some of those drop pods teleport thingie's and "beam" down a shit ton of troops in . from behind enemy lines. I know its bad story writing ( on blizzards part) but tactic wise you could use that thing for many options. You are acting like its a hot air balloon and you are also acting like i think its the death star. Its neither, its a b-52 bomber in a medieval world.