people who dont' want AoE toggle are not saying they are too lazy to push the damn button, the button should have nothing to do with this change. The problem is that its harder to balance all aspects of a spell with the toggle:

how much MP should a spell cost? does the MP change based on whats toggled? how does the system show you before you choose the desired spell if u can cast it? How much emnity does it generate /w or w/o aoe toggle?

ex. you have 30mp, you need 24 to cast Sacrafice III. But wait you wanna click AoE toggle now it costs 124MP and the spell fails? this is the kind of clunky play that the button creates. The way around this was making aoe/single target the same MP which SUCKS this creates a zombie of THM's main healing afk style by spamming Sac-II all day long.