Maybe I'm a little out of the loop on BST, but magic Ready moves aren't utilized at all on end-game content? Or are they situationally?
Situationally Incredibly useful:
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There are a few NM's which take extra magic burst damage which it really helps for. Those are Escha-Ru'aun fights iirc. maybe some delve fights.
I use magic ready moves for CP farming. Magic AoE's are usually more reliable for mass killing. Namely Fireball on Warlike Patrick and Cursed Sphere from HeadbreakerKen.
They both use only 1 charge instead of 2 for Tegmina Buffet. They have greater range also.