Getting rid of all the unnecessary departmentalization of single target and AOE would do a lot more for preserving hotbar space. What I mean by this is where many jobs have two of the same button, but one is for bosses while the other is for trash mobs. FFXIV doesn't feature any combat elements that interact with the concept of target-ability outside of a very tiny set of examples, such as the Magus Sisters. It's not worth it to have entirely divorced AOE rotations or actions because you never use them outside of very shallow combat encounters.

Samurai is a job that has "too many buttons" apparently, right? Going off of Samurai's current action list, you could very easily clear up a lot of hotbar space doing the following:

Fugo > replaced with Yukikaze: Delivers an attack with a potency of 100 to all enemies in a cone before you. Combo From Hakaze: Potency increases to 300 for the first enemy and 75% less for all other enemies; Increases the Kenki by 15; Grants Setsu.

Kasha > replaced with Oka: Delivers an attack with a potency of 100 to all enemies in a cone before you. Combo from Yukikaze: Potency increases to 120; Grants Fuka for 40 seconds; Increases Kenki by 10; Grants Ka. Combo from Shifu: Potency increases 330 (380 from Flank) for the first enemy and 75% less for all other enemies; Increases Kenki by 10; Grants Ka.

Gekko > replaced with Mangetsu: Delivers an attack with a potency of 100 to all enemies in a cone before you. Combo from Yukikaze: Potency increases to 120; Grants Fugetsu for 40 seconds; Increases Kenki by 10; Grants Getsu. Combo from Jinpu: Potency increases 330 (380 from Rear) for the first enemy and 75% less for all other enemies; Increases Kenki by 10; Grants Getsu.

^ Yukikaze is the same as it is in single target, but is now also your AOE combo starter. Oka and Mangetsu replace their single target variants and just have slightly different effects based on whether you combo them form Yukikaze or from Shifu/Jinpu respectively.

Hissatsu: Shinten > upgrades into Hissatsu: Kyuten: Delivers an attack to all nearby enemies with a potency of 250 for the first enemy and 50% less for all remaining enemies. Costs 25 Kenki.

Hissatsu: Senei > replaced with Hissatsu: Guren: Delivers an attack to all enemies in a straight line before you with a potency of 860 for the first enemy and 75% less for all remaining enemies. Costs 25 Kenki.

Shoha II > Replaced with Shoha: Delivers an attack to all nearby enemies with a potency of 560 for the first enemy and 75% less for all remaining enemies. Costs 3 stacks of Meditation.

^ That is 6 less hotbar slots, and both single target Samurai and AOE Samurai is roughly the same. I chose cones since that requires a target for single target, meaning you can't whiff them in single target, but they can also be circles if we're that allergic to cones on Samurai for some reason. Potencies in AOE are a little different, and can also be easily adjusted. They're more focused on the first target you're hitting rather than equally distributing damage across all enemies, but I don't feel that's an issue.

Either you slim down total action counts, which do make things more comfortable for everyone, not just controller players, or you can use that newly freed up space to add something else to jobs. Maybe use that extra space for more ways to spend Kenki on Samurai, for example.