“Ignoring” is not the same as “noticing”; the difference is right there in the words!
You are right that it is undesirable to be a slave to one's emotions, to keep having emotional outbursts or “expressing” all emotions impulsively. But at the other extreme if you try to address this by building a habit of dissociation and “ignoring” your feelings (as you propose), that is also not good, and not how Stoicism or meditation address it. (To use an analogy: it would be bad for a parent to be a slave to their children, or for a charioteer to be led by their horses instead of controlling them. But ignoring them isn't great either!)
Stoicism addresses this preemptively, building a practice of having a proportionate response to things outside our control. Meditation also addresses this by, as you said, noticing emotions when they arise, recognizing them for what they are (creating some distance), and letting them pass instead of indulging them. Ignoring your emotions or letting them burst out are both different from letting them pass/seeing them through.
You are right that it is undesirable to be a slave to one's emotions, to keep having emotional outbursts or “expressing” all emotions impulsively. But at the other extreme if you try to address this by building a habit of dissociation and “ignoring” your feelings (as you propose), that is also not good, and not how Stoicism or meditation address it. (To use an analogy: it would be bad for a parent to be a slave to their children, or for a charioteer to be led by their horses instead of controlling them. But ignoring them isn't great either!)
Stoicism addresses this preemptively, building a practice of having a proportionate response to things outside our control. Meditation also addresses this by, as you said, noticing emotions when they arise, recognizing them for what they are (creating some distance), and letting them pass instead of indulging them. Ignoring your emotions or letting them burst out are both different from letting them pass/seeing them through.