Spears are just daggers with too much handle.
Here are a couple of reasons not to include them - all that reach is like an "I win" button for melee combat. And that goes both ways. Imagine an enemy poking you with a spear and you can't get close enough to hit back. Annoying.
Play Mount & Blade: Warband - mod cRPG then get back to me on that.
Are they really so popular? I've never seen the attraction myself.
I'm not 100 percent sure as to why Beth never includes them in ES but I think it has something to do with them "not fitting in with the game world" or something along those lines.
Polearms were very popular for fighting, especially among Nordic types...even more than the fantasy axes everyone seems to love... :ahhh:
Their were spears in Morrowind, didn't really see any of them though.
It also wouldn't be hard for them to do the animation with them, as they would just need to use the Oblivion staff animation with some tweaks.