I think we have many opinions on the subject because we are all different.
FOR ME, DFK is a must. I will not leave if the girl does not provide it (Even when GFE was advertised) but I will not go back see her.
I'm a GFE guy, no matter how you say GFE is illusion, I like GFE to be provided and look as genuine as possible.
I do not like to look like a guy that just go to bang a hole and I don't like a SP that acts like I'm there to bang a hole.
I like to be sweet and get and give tenderness.
I like teasing and preliminary.
DFK is a great act of tenderness, teasing and preliminary.
For me, it lets me show the girl that I respect her very much for what she's offering me.
I often take only 30 min and DFK right at the beginning or after some short chit chat will get me hard quickly.
We do not have to kiss for long. It's a very good way to break the ice and get started.
Usually, 5 min chat, 30 sec DFK... BJ 5min, 30 sec DFK, Daty/69 5min, 30 sec DFK, FS 5min, all done in about 20min with some chat before leaving.
There are many kind of DFK/LFK. The more sensual the better!
I go see a SP to get sex yes but also with a small dose of tenderness...