I never said Ne doesn't share the ideas. But to come up with ideas requires one to think, so it's going to be an intermittent sort of sharing.
I disagree that FiNe types choose words and actions as carefully as NeFi types. Ne types can see possible consequences of what they say and do better than Fi-types. So while Fi-types may choose words and actions carefully, NeFi types will choose words and actions even MORE carefully.
I think both IEE and EII are reserved with people they dont feel comfortable with, and become more extraverted around those they are comfortable with.