Had an unruly thought, possibly not true:
Ni/Fi is an identity. The contents of Ni--naturally viewed as objects, because Te gives such a worldview, and also naturally viewed at arm's length because Te aims for "objective--are nonetheless identifiable with the user, to a greater or lesser degree depending on Fi investment. Screw with the ideas and you screw with the person.
And there's another thing: Te is almost always about things to do. Being as it takes the outside world for granted, it moves from observed conditions to statements of natural order, like "Well, that means this thing is wrong and that object is out of place and this process is flawed and it can all be fixed by XYZ."
What then? A person who sometimes identifies with solutions to problems and has a low powered attachment to actually taking part in the world, so.... something.
In any case, does anyone know this stuff from the ENFP side? Se anxiety is real in INTJs, and their character forces them eventually to find ways to cope. It all gets solved in the end, anxiety or no. What about the ENFP experience? What is Si anxiety?
Si Anxiety. Not that nothing will succeed but that nothing can be done? There will always be no way to know for sure what's right?
I have no idea.
ps. inferior Si is in your life from the git go influencing your choices and approaches. There is no ENFP that has no Si. There are plenty of ENFPs who haven't consciously spelt out its influence.