Expressing feelings aren't the same as having a tantrum IMO. Feelings are just feelings. Exploring them can helpful information and can be done in respectful and even healthy ways. Some people don't want to explore them which is fine. But if certain feelings keep arising around certain situations and interactions and it is impacting our life in a negative way or in a way that is not what we want it is often a sign that something needs to be looked at more closely.

How we express them at times i.e lashing out in anger, saying something mean or hurtful because we are hurt or throwing a tantrum is not helpful but sharing them and what is coming up can be