Not really, I don't have to have better examples. It's a daedric artifact. The Daedric Princes are known for making outlandish and powerful weapons. So it doesn't make it any more real that it would be part of world as a common weapon. Well seeing as how in the only game they were ever in they were unbalanced and potential game breakers sort've makes it evident. People keep saying "it's a different game". Cool, it's a different game, but you still have to change the mechanic of spears to not make it overpowered. Being a different game doesn't magically fix them and making a weapon that is basically the same thing as spears but used swings to balance instead of stabbing is a bit easier than wasting development time trying to fix something that already is in the game in the form of the other polearms. That's like adding in a type of sword just because it only stabs, there is no point when you already have a basically the same weapon.
If people want to mod in spears, then all the power to them but spears have most likely been put back in the game in the form of polearms and there is no need to have overpowered spears in the base game.
You could say the same about some certain swords, warhammers, and maces (Goldbrand, Voldenrung, and Mace of Molag Bal are good examples). So, I guess if we were to go by that logic, then swords, warhammers, and maces wouldn't be in the game.
Again, it's a different game, so it doesn't have to be that way.
They had to change the mechanics of how swords, axes, maces, bows, and every other weapon works, so what makes you think they can't mess around with spears as well? And if they can implement other polearms correctly and properly balanced, then how can they not do so with spears?
The rest of that paragraph is just silly (I know I've been saying that a lot tonight, but it's true), so I'm not even going to bother arguing against it. Well, except for the part about other polearms, which I already said I agree with you on.
There are plenty of ways to fix issues, and Bethesda has like 9 months left figure out how, so development time is definitely not in any shortage whatsoever.