@
Fay
EII are in the 'Cause-Effect Thinking' group (with NeTi, TiSe, and SeFi).
NeFi are in the 'Holographic-Panoramic Thinking' group (with FiSe, SeTi, and TiNe).
Some of what you are talking about could be related to that.
EII also have Ni demonstrative, which is stronger than their Ne, but not (typically) 'conscious'.
I can see possible manifestations of Ni helping them initially feel sure about a decision, but then when they go to act on it suddenly feel swamped by other possibilities they could still choose from (or could have chosen from).
(For myself, I'm not only seeing other options or approaches, but when I'm about to make a decision, I flip my POV on it, and see the cons against it. I can be so racked by indecision that there comes a point where I just have to 'hold my breath and dive in'. I think this is one way that IEE are tactical, yet EII are strategic.)
Another possibility is a relation to e6. (For myself, what I described could also be related to e6w7.)
And then there's the psychological phenomenon known as FOMO (Fear of Missing Out). It's typically described in terms of social media usage, but I believe the underlying factors would extend FOMO out to other aspects of life. Especially when making major decisions, as you are deciding what experiences you might have. Example, the experiences and understandings you'd have pursuing a teaching degree will differ from what you would get from a psychology degree which is different from what you'd get as a NASA technician. Differences in locations you choos to live in would influence your cultural experiences, as well as weather related experiences (cold north leads to differing experiences than warmer south; earthquakes vs tornados, etc), and even political influences between a primarily blue region vs a primarily red region.
And looking at one's present circumstances and how they may have come to be, one can see how major decisions in the past affected one's life, and how having made different choices could have led you somewhere other than where you currently are. These considerations can cause decision paralysis.
And finally, it's rather well known in psychology that there is such a thing as too many options, and that the more options there are, the more difficult it is to decide from amongst them.