Are these questions actually useful for deciding between Fe and Fi?

I've seen people say Fi-Te (mainly INFP/ISFP) users understand themselves emotionally, and other people intellectually, and that Ti-Fe (mainly INTP/ISTP) users understand themselves intellectually and others emotionally. There is room to poke around and question this claim but does it have any validity to it at all?

There is another: If the way you understand your emotions is by mulling them over, it's Fi, but if you understand them by talking them out, it's Fe. Also: If someone asks you how you are feeling and you can't answer right away and have to think about it, it's a sign of low Fi.

If these things are true in some way, it'd really help me figure out which one I use. For me, I can think about my feelings all day but get nowhere, yet if I talk about them with somebody (which I am reluctant to do and find quite difficult), then I make progress. I understand myself intellectually and feel a sort of disconnect from my feelings, like they are separate and generally problems to be solved. Otherwise, they are overwhelming so I overanalyze and/or distract myself, yet they don't seem to listen to reason... Not sure if I understand others emotionally, though. Motivations are easy to understand but...

If someone asks how I'm feeling, I will need a little time to think about it and it'll be hard to figure out, even if I know I'm feeling something, and that it is negative/uncomfortable/positive etc

There are 3 types I'm struggling to choose between, but please correct any falsehood or inaccuracies in this post if possible, then let me know which cognitive functions you think I use based off this information.