First, regarding PSE; I don't think that term specifically means uncovered everything, but I could be wrong.... it does happen once in a while lol.
I don't read other ladies' reviews often but of those that are PSE the common theme appears to be that you can expect the lack of limitations, come-fuck-me-NOW attitude seen in porn flicks. Including, but not limited to: BBBJ with DT, many positions including those you wouldn't expect of your average GFE, Greek, ATW and even a few more exotic acronyms, depending on the specific lady in question. Also, you really shouldn't expect the date-type atmosphere that many GFE providers strive to create. Some PSE experiences ARE also GFE in that regard, but from what I personally have read, many are not... and the clients often seem to prefer it that way in those instances.
GFE: when defining it by services/acts offered, the common opinion on these forums seems to be that ALL of what you mentioned should be on the table: DFK, DATY, AND the ever-popular BBBJ.
Now, that being said... I've found in my experience (and I've been providing since before this term existed, and for far longer than I will EVER admit) that many men/clients have their own personal definitions of what it means to them.
Sort of like, "Beauty is in the eye of the beholder", these terms also seem to be subjective regardless of what the reviewing community at large defines them to be.
So if GFE to you means DFK: I'm not going to tell you you're wrong. But please bear in mind (I've said this before, and will say it again any time I deem it pertinent to the topic at hand) that what one man thinks of as LFK could be that chosen lady's definition of DFK, and thus his idea of DFK would then be that lady's definition of a tonsil-exam-by-tongue. LOL!
Trust me on that one. :-P
Of course, the reverse is also true: you could think that a lady who offers DFK goes way overboard with her tongue when she doesn't think so at all.
Keep this in mind: NOBODY~ and I mean NO ONE~ thinks they are a bad kisser.
heh heh heh heh heh