User blog comment:Madman97/The Wabbajack Grinding Season Finale is NIGH!!!/@comment-1600847-20130813211340

The reason Bethesda gave for removing spellmaking:

"We didn't want the game to have a 'spreadsheet' feel".

Even though it used the SAME FORMAT AS ENCHANTING. I think they just got lazy and came up with a half-assed excuse.