Well, yeah, naturally. I was bringing it up because some people might want to opt out of the update since you get the icon sitting there the whole time and the update doesn't seem to add anything else major.
There are bug fixes with that update as well. Besides, the "schools of magic" button is really tiny and next to the options button which was there anyway to begin with. I don't know, it just seems like a really silly reason to me to not want to get an update for a game.
If you liked the base game, and want to play more, why wouldn't you want to add more of the same? It's more of the same, it's good.
None are... but if you want to expand the game a bit, get the expansions, the weapons etc you can skip.