I agree. Also, emotional regulation is a thing—feeling an initial flash of anger is one thing, but allowing yourself to be consumed by it is another. I think I have pretty good emotional control of my anger, I rarely lose my temper at people and I'm generally pretty good at channeling it productively.

But the reaction doesn't go away, and it is also linked to other things like taking care of your physical health, diet, sleep, etc. taking accountability for your reactions to things ultimately involves cleaning up a lot of the rest of your life, too. Plus people can find it hard to believe that healthier people are less angry, but I firmly believe this is true based on my own observations of myself—so in this sense, emotions kind of are a choice, with enough practice and desire to achieve this and luck.

It is indeed very difficult to separate emotion and behavior, both concepts are encapsulated by the same continual shifting attention. That maintaining control over this shifting of attention is the focus of so many philosophies (eastern and western) shouldn't be ignored.