Again, here: https://wow.gamepedia.com/File:Sargeras.JPG
Again, here: https://wow.gamepedia.com/File:Sargeras.JPG
Ah, different picture than the one I'm thinking of from Chronicles.
To be fair, looks like he lodged the sword deeper, and that planet still appears intact in the picture.
Also, you've obviously never been an artist, otherwise you'd know about this thing called "artistic expression" and how it is often allowed that the artist can add their own personal tweaks to something. When Blizzard had that idea for a picture, you can't know if they planned the planet to look that cracked up.
Also, who knows, maybe he sat there sticking his sword in for a longer time, adding damage overall, kind of like a DoT. He barely got the sword in Azeroth before being pulled away by the other Titans.
Either way, I think you're freaking out way too much buddy. Just enjoy the art and think less about it. It's a damn video game.
Don't think about this stuff too much. Deathwing's size changed so often in Cataclysm that it's jarring if you were to put them side by side.
In some quests he was the same size as Alextrasza. Then in the raid his head alone is the size of the Maelstrom's whirlpool.
Take 2 watermelons and stab one with a knife and plant a small explosive charge in the other one, see which does more damage.
*Cough*
Planets and Watermelon's don't work well together.
That's like comparing them to a Meteor: Throw a Pebble at a Water Melon, and it wouldn't do any damage. Yet, throw a Meteor at Earth, and you'd have the Planet getting harshly damaged. Same thing goes with the Knife, and Sargeras' Sword.
I don't think the comparison between an asteroid that killed the dinos and a sword wound are entirely appropriate because a sword stab has a very small area and large depth, whereas a meteor impact would have a small depth / large area, which means there is more dust driven into the atmosphere (dust and the associated cooling of the surface is what killed the dinos, not the impact itself).
Nonetheless, I wish Blizzard would at least nominally acknowledge the effects that such a stab would have on the planet - e.g. massive quakes all around the impact point, some amount of dust in the atmosphere, and presumably volcanos opening up all around the stab area (the rock mass that the sword drove down into the planet's crust will seek to reemerge elsewhere - most typically as a volcanic eruption). If they didn't want to create cataclysm like effects around Slithius area, they could explain it away by Kirin Tor wizards dedicating their entire power to keeping the planet stable.
Shouldn't nothing happen when my character makes some weird hand signs and chants some odd speeches? But then magic comes out! Mighty unrealistic, if I might say.
Either way though, it still exists. :/
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I'm not talking about the Chronicles....
https://wow.gamepedia.com/File:Sargeras.JPG
(Yes, ik it took place in the RPG. However, he's still Planet Sized, that Sword is still that fucking size in the 7.3 Key Art, so it counts).
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Imagine you doing that shit IRL:
DON'T TOUCH ME! I HAVE THE POWER OF BOTH THE PANTHEON AND THE LIGHT BY MY SIDE! AHHHHHHHH!!!!!
Taeshalach exists in name only. It's Aggramar's sword. That is the only thing that is canon about it. The RPG is non-canon by default. Taeshalach being the good half of Gorshalach is not canon. Sargeras keeping the evil Gorribal half of Gorshalach is not canon.
That image of Sargeras stabbing a planet is from the RPG, thus not canon.
Deathwing was a hammer across all of Azeroth doing damage to everywhere. The blade is a stab wound localised but every damaging to that region.