Is 8. Nf3 really "harmless" in the 5 ... Ne7 Ruy Lopez Exchange?

I'm trying to build a repertoire on Ruy Lopez Exchange (as White) and am using books and computers.

Panczyk and Ilczuk's book (2005) claims that 8. Nf3 is "harmless" and that 8. Qg5 is best. Rybka 4 (after several hours) puts 8. Nf3 as the best move and 8. Qg5 as the 2nd best move. It's a peculiar situation. 

Also, 365chess database:

Any thoughts?

No 8.Nf3 it's not harmless compare to 8.Qg5 . What you see in Databases it's a preference.

I believe players who avoid the 8.Nf3 it's because has more tricky theory. After 8...Qxe4 9.Qa5 Bg4 if white does not play 10.Qc3 the game it's gonna be short! If actually play 10.Qc3 then the game it's not bad for black.

I believe 8.Qg5 it's more fashionable because maintain the tension for white. ( edit) After 8...Bg7 9.Nf3( or Nd3)...Qxe4 white can use blacks Queen to gain development and pressure. Rfe1! c3 preparing d4.

Anyway I can't find other reason.

Actually, 8...Qxe4? is a mistake.

they only said queen takes after Nf3

 It is obvious a move order mistake. I write : white can use blacks Queen to gain developmnent Rfe1, c3 preparing d4. 

 That cant happen while the knight is on e5? correct Mr. Chessfun? 

I stand corrected. You meant that the queen takes on e4 after 8. Nf3. For some reason, I was focusing on the 8. Bg5 variation. By the way, there's no need to resort to name calling after a misunderstandment. It's both lame and silly.

Yes I lost the move order but I edit my original post. What I actually meant is Qxe4 after 9.Nf3 but as you see it's very easy to misunderstand if we miss a move. Anyway, the initial mistake started from me so there is no reason to do not accept it. Sorry for my silliness. Shit happens.