Some characters / team comps are a little different as far as execution, but most all come down to having a bread and butter combo and skill order. So, yes, once you’ve found an optimal rotation that is what it boils down to. There are characters that are more positional or skills that require certain mob grouping or conditions to be optimal. Some mobs have AoE to worry about or other skills to consider.
I mean if you’re way OP for content then yeah, mash buttons works. That’s the same for every game that exists on some level. The AR45+ domains ramp up and positioning, resistance, and DPS matters more. The other stuff is just pretty spammy. I’ve never been high on the combat here but the intricacies start to make more sense in the higher level content. It just isn’t that important early on when you can face roll stuff.