While you know exactly what techs are in what category and what the prereqs are, you can never be certain as to what you're getting, unless there's only a single tech left in that category (which does, and should, happen). It's hard to explain how this randomization works, short of playing Alpha Centauri.
Alpha Centauri's research was one of the first things I thought of when I saw this thread.
From what I've heard about MoM, I think I'd like that for spell research. But still definately GalCiv-influenced 'blind' "Alpha Centauri"-styled tech research.
I agree, Alpha Centauri style research would not be useful for spell research. It would be very good for technology research though.
Some basic areas Elemental could use for focusing:
Warfare: armor and weapons, other military related areas
Industry: machines and tools, better production
Knowledge: makes research easier, unlocks important technology in other areas of focus
Expansion/Growth: improve city growth, better scouting, can use land better(ex better farms)
One of the best things about Alpha Centauri's research was that you could turn blind research off at the start of the game and be able to select what you want like in GCII and other games if you wanted to.
I really want technology with multiple pre-requisites where it makes sense(such as high quality weapons and armor requiring a cetain level of metalworking research in addition to previous weapon/armor research).