I'm just gonna go ahead and make up a lot of stuff here. Look out below:
Is it so mysterious? It's feeling that depends on... something... outside the person.
(Yes or no? I dunno. I'm just guessing. But it does say "e".)
It's a rational function. It provides judgements. So...
Fe does or doesn't recognise the existence of Fi?
Maybe it does as the user matures.
Does it recognise any value in Fi?
But I think Fe users want to see feeling in others. (Feel feeling in others?) I suspect recognition of Fi is an intellectual process rather than an emotional one. Or at least it's a process that requires more steps than getting straight Fe from others.
ESFJs are better at this than ENFJs? ESFJs have 3rd function Ne. ENFJs have Se instead. If ENFJs are going to "get" Fi, it's with auxiliary Ni, and that takes time.
So, INTJs can be with ESFJs but will be vexed and put upon by ENFJs always trying to turn them inside out? And perhaps conversely, ISTJs can hold their own with ENFJs but are solely distressed by ESFJs? (I read somewhere that ENFJs enjoy the company of ISTJs...)
Dunno. Whatcha think?