the problem with spell making was it was so rigid and spread sheet like it did the opposite of what it was mean to do which is make you feel like a mage. but instead of thinking about your spells your wondering how high you can get the numbers and still have enough magicka to cast the spell. and lets not forget how boring the spells where they where just balls of different colored light with different magnitudes durations and radius's thats it. no stream spells no wards no centering around the caster (without hurting the caster) no cloaks and no runes nothing but ranged blobs cast on self or touch spells of varying magnitudes radius's and durations.
I'd imagine that a mage that wanted to survive for long would spend a lot of time thinking about spreadsheety issues like magicka cost, duration, intensity, and the balance between them. A mage who frequently develops spells would probably kill for a good spreadsheet app. Mages who don't think like that probably blow themselves up pretty quickly. Or get eaten when the spells don't work as expected.
But spreadsheet type calculations don't get shown in movies because they're boring (like scientists, engineers, computer programmers, etc.). So, despite the fact that a spreadsheet is an efficient and fast way to precisely control your customization, I can see that it doesn't appear mystical enough in a Hollywood sort of way.
What I don't get is an argument that says "BGS didn't give me a flashy, inefficient gimmick for feature X, so it should be removed".
Also, the "balls of color" argument, is IMO, one of the worst possible arguments. It's form over function. Do people really think that it's more important to have 3 fancy animations instead of 30 different
effects? BGS removed at least a dozen, probably more, unique spell effects from the game. But they did make the ones they kept prettier. I don't see that as an improvement.