What I expect of Black Mage/ Thaumaturgy in 2.0

[Jinrya-Geki]

Comboing different spells together. Example will be an iron giant.

You use fire spells over and over, the iron giant becomes a vibrating red, hit him with a powerful ice spell and you just rapid cooled metal, making it temporarily immobile.

Best part of it? Black Mage would have an interesting way to enfeeble, while not actually using the spell, allowing other jobs to carry the enfeeble spells themselves.

[Rubicon]

You use fire spells over and over, the iron giant becomes a vibrating red, hit him with a powerful ice spell and you just rapid cooled metal, making it temporarily immobile.

Honestly, if ARR doesn't have boss fight elements like this (not all but some and probably the most memorable fights) then they are already screwing up.

[Shurrikhan]

Comboing different spells together. Example will be an iron giant.

You use fire spells over and over, the iron giant becomes a vibrating red, hit him with a powerful ice spell and you just rapid cooled metal, making it temporarily immobile.

Best part of it? Black Mage would have an interesting way to enfeeble, while not actually using the spell, allowing other jobs to carry the enfeeble spells themselves.

Love it, as I think I've mentioned before. Well, this would certainly make fire and ice more useful in combat, but how about the actual amount of spells? Do you still want to be using primarily just Tier I spells, and "combo-ing" up the tiers occasionally? Would rather not use tiers? What kind of tactical differences should there be between tiers? (Certainly not just AoE / ST, even if certain patterns (each with progression of spells) would obviously suit one or the other better.)