Not necessarily what I had in mind for an answer, but I take it as a start for a conversation.
The point is, that every single author in every single chess book about the Ruy Lopez, that has been published since Max Euwe's "Theorie der Schacheröffnungen" in the 1960s, virtually took the following "main line":
1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 exd4 5.0-0 c6 6.Bc4 Nf6 7.Re1 d6 8.c3 Ng4 9.h3 Ne5 10.d3
where everyone only states "and after 10...Nxc4 11.dxc4 dxc3 12.Nc3 White has pressure on d6 and therefore a comfortable position".
I agree with that. BUT, Black does have other possibilities! He can play 10...Qb6!?, which I consider a viable alternative (I discovered this move myself, although I found later that it was mentioned as a brief note without any analysis in a small booklet written by Colin Leach back in the 1980s). I played it in some tournament games and on numerous occasions on ICC, both with good results. Players in my area even avoid the Ruy Lopez against me, because they haven't found a way to secure an advantage yet.
But in this forum, maybe someone will convince me