Is Argus the Appropriate Final Boss of Legion?

One of the big questions about the future of World of Warcraft since its inception was this: when do we get to fight Sargeras?

There was a sense, of course, that Sargeras would have to be the final boss of the final expansion, that everything in WoW would have to build up to the confrontation with the Dark Titan. It was Sargeras, after all, who turned Kil'jaeden's "let's genocide the Draenei" project into the army that would invade Azeroth. Sargeras is the architect of the First War - the war that started Warcraft as a series. His influence is seen through the history of almost all of the races, and the Alliance and Horde exist as they do today because of the machinations of Sargeras.

While the Void Lords and their servants, the Old Gods, are potentially a larger cosmic threat, none of them has had the kind of pinnacle position as Warcraft's primary antagonist the way that Sargeras has, and in an expansion called, simply, Legion - named for the Burning Legion, which was the instrument of Sargeras' apocalyptic crusade - it seemed only logical that we would face the Destroyer himself.

So when we discovered that the final boss of Antorus, the Burning Throne, would not be Sargeras, I imagine that many of us were somewhat puzzled.

Make no mistake: Sargeras is roundly defeated at the end of Antorus, and while he is not killed, exactly, it seems that killing a Titan is not necessarily possible, given that the other members of the Pantheon are there to aid us in our final battle.

A fight with the Dark Titan seemed the promise of the Legion expansion. What has been delivered is a fight with a Dark Titan.

Argus is actually the first final boss of an expansion that did not appear in previous games or expansions (C'thun has sort of become the final boss of Vanilla, but only after the original version of Naxxramas was removed, and Kel'thuzad was well established in Warcraft III.) In fact, we had not even heard of the Titan Argus until 7.3.

Now, granted, with the revelation that Azeroth has an embryonic Titan at its core (of the same name,) and the revelation that we were going to finally travel to Argus, perhaps we might have made the logical connection that Argus might have had a World-Soul as well. Indeed, if we count the planet and the World Soul as one and the same, Argus had, in fact, been a known character as early as Burning Crusade (and possibly earlier, as there was a Shadow-Council-offshoot in Alterac Mountains called Argus Wake.)

I don't mean to imply Argus is not an epic adversary to fight. Indeed, my Draenei Death Knight fighting and slaying the soul of his own homeworld is epic on a Dark Souls scale (almost makes me want to just have Gwyn's theme play when I get to that fight on that character.)

But one has to wonder why Blizzard decided to do it this way. Why not let us fight Sargeras directly? He does appear in the end cinematic in his full fiery glory (I like that his fire is standard orange/red, as if the Fel infusion could ignite his internal flames, but that he's still fundamentally an arcane being, and thus green flames wouldn't come out of him,) so why is it that we can't go toe-to-toe with him? What are they saving him for?

Legion has been an expansion of finally getting to do a lot of things we've waited for. We finally got to the Emerald Nightmare and killed Xavius (killing what we had previously assumed would be the boss of a whole expansion in Legion's very first raid,) and we got to visit some locations, like Deathwing's Lair and the Tomb of Sargeras, that we had been speculating about for ages. We got to go to freaking Argus - another example of something that could have been a whole expansion - so why, then, are we not getting to plant our feet and tank Sargeras himself?

There's no logical time to do so in the future. This is the Burning Legion expansion, and there's a degree of finality to Sargeras' imprisonment that would require making this whole expansion and Illidan's entire character arc totally invalid in order to bring him back as a threat.

If they're willing to let us fight not one but two Titans, surely it's not that much more of a leap to say that 10-30 of Azeroth's greatest heroes could't take on the Dark Titan?

And if fighting Sargeras is a mythic-only phase on the last fight, I'm going to be really pissed off.