Am I ever glad I have read this! A lot of things are beginning to make sense.
The ISFP I know's sentences are often reduced to :
"That's beautiful!"
"That's bad."
"That's good, then."
"Ok? Ok?"
(Sums up the last phone conversation I had with her. She sounds a lot like Stepho from what I've heard on her video. Same sweet, shy hesitation.)
But she once sent me a letter she wrote at a time when she was quite depressed and probably in some sort of NT shadow function. Splendid letter with english words I had never read in my life. I still have it. From what I have read that she wrote with care, she can be quite poetic.