Some things I do not like.

[ty_taurus]

This is what I'm talking about, though I do understand why ST and AOE is seperate (AOE does less damage, but to more mobs). So, with SMN, we have Ruin and Gemshine for single-target with Tri-Disaster and Precious Brilliance for AOE. However, Gemshine and Precious Brilliance aren't even clickable unless you have a summon up. When they are up, I'm using them instead of Ruin and Tri-disaster. It's a waste of space. Instead of having Gemshine and Precious Brilliance become active and change depending on summon, just have Ruin and Tri-disaster handle it instead. Free up a couple of spaces.

Yes, you can do it in a macro, but that's not optimal either because the icon is static. You aren't sure what's being cast. For example:

/ac "Gemshine"
/ac "Ruin"

This casts gemshine (including whatever it becomes due to current summon), if available. If not, casts Ruin. BUT! It doesn't update the micon. Using:

/micon"Gemshime"
/ac "Gemshine"
/micon"Ruin"
/ac "Ruin"

This still works, but the micon remains Gemshine.

Anyway, the point is, unless you have a summon out, GS and PB don't do anything. Wasted space. It seems like a much better idea to morph Ruin and TD instead. This is what I mean by "button bloat."

Then, we have Ruin IV, which is suddenly an AOE and procced. Um, why? Let Ruin III upgrade directly to IV, along with the above. Another button gone with no loss of utility.

If macros were a little more robust, and were queueable, things might be different. Now, as I said, I'm fine with SMN as is, thought it could be even better. The point is that I see even more of this in other jobs. It's all a bit overwhelming for me. I'd love to play other jobs, but as it is, I'm pigeon-holed into SMN. My bars are simple:

3) bahamut, garuda, titan, ifrit (in phase order) [Mouse]
2) Gemshine, Precious Brilliance, Fester, Painflare (single, aoe, single, aoe) [F1-F4]
1) Ruin, Tri-disaster, Energy Drain, Energy Siphon (single, aoe, single, aoe) [1-4]

The rest are mostly buffs and role actions and fill the last four buttons on each row, grouped accordingly.

Ruin IV does need to stay as its own button as you don't want to use it when Astral Impulse or Fountain of Fire are available during your Bahamut and Phoenix summons. You can hold onto that proc until after your summon goes away, so it does need to be independent. Otherwise you could probably have Ruin III and Tri-Disaster upgrade with your summons since that's what Bahamut and Phoenix do anyway.

I'm not sure how good this would work with this example... but here's a solution you could do better with macros for SMN:

On my SMN Hotbar, I have Ruin III set to hotbar 1, position 5 and Tri-Disaster set to hotbar 1, position 8. Using my hotbar positions as reference, you could do a macro like...

/micon "Summon Garuda"
/ac "Summon Garuda" <t>
/chotbar action "Gemshine" 1 5
/chotbar action "Precious Brilliance" 1 8
/wait 9
/chotbar action "Ruin III" 1 5
/chotbar action "Tri-Disaster" 1 8

This would replace Ruin III and Tri-Disaster with Gemshine and Precious Brilliance respectively for 9 seconds and return them back to Ruin III and Tri-Disaster. You could do this with all 3 summons while giving you enough time to use all your charges, but I would probably recommend making a separate macro that just reads:

/chotbar action "Ruin III" 1 5
/chotbar action"Tri-Disaster" 1 8

To forcibly get your buttons back if they don't change back when you need them too. Perhaps you may even just want to always do that manually so if you have to go do mechanics or something and can't use your charges, you don't lose those until you're ready to go back to Ruin III and Tri-Disaster. I don't know how well that would ultimately work for you, but maybe try it out and see how it feels. Just replace the "1 5" and "1 8" with wherever you have those buttons on your hotbar.