I think I'm the odd one out on this one, but I really don't like having completely divorced AoE buttons in a game that doesn't really have engaging AoE situations. Like, I don't really see why we need to dedicate 2 different buttons to things like Xenoglossy and Foul, Shoha and Shoha II, Bloodletter and Rain of Death, or even combo buttons. Take MNK for example, I feel like you could have Bootshine upgrade to Shadow of the Destroyer, Twin Snakes upgrade to Four-Point Fury, and Snap Punch upgrade to Rockbreaker, (maintaing higher single target damage with falloff instead of flat damage to all targets), and you'd have 6 buttons instead of 9, not change your Single Target Rotation, and just have your AoE rotation be one specific combo within that Single Target Rotation, not to mention you could have Forbidden Chakra upgrade to Enlightenment as well.
I don't feel like having AoE buttons separate is really doing anything for us. There are a rare handful of fights where making the choice between single target and AoE is somewhat an opportunity to squeeze out a little more DPS. Like in Tower at Paradigm's Breach, Hansel and Gretel are an interesting boss where they're regularly moving both away and close together, and making those decisions to try and hit them both (assuming your AoE buttons are a gain on two targets) is a little more varied, but beyond those few fights... with the Forbidden Chakra example... When are you ever going to actively decide between one or the other? Either there are multiple enemies, or their aren't.
So I agree a little with SailorCeti that SMN, ironically, has a lot of unnecessary buttons for how it currently plays, though I wish rather than just having such a departmentalized approach to single target and AoE, that you had a 1-2 combo with your AoE buttons like with how Shadowbringers Phoenix phase worked--how you'd alternate between Fountain of Fire and Brand of Purgatory, and just do that with your Ruin III and Tri-Disaster, as well as your Gemshine and Precious Brilliance. Though I don't see why both Energy Drain and Energy Siphon need to exist, nor Fester and Painflare. So even though SMN is still a very bare-bones job and definitely needs to expand on its current gameplay, even it has unnecessary buttons despite that.
But I don't think most players agree with me on the single-target vs AoE stance.