There is that of course. But also maybe that to try to get advantage against all of Black's choices in Ruy López is not so easy 

Before the Everyman Najdorf book there was Modernised Najdorf by Pavlovic (Thinkers Publishing) in November 2018. Besides those books there seem a few Najdorf DWD and online resources though.

Coming back to Ruy López, playing the main line is a heavy theoretical studying. To play White repertoire you have on move 3 the serious variations Smyslow (3...g6), Cozio (3...Cge7), 3...Ac5, Jænisch, not to mention the big Berlin. 

Once past 3...a6, then you get the Open, Архангельск.

Past that you have the Marshall or corresponding Anti-Marshalls...

On move 9 you have Breyer, Чигорин, Карпов, Зайцев...

And when Black is basically equal in most starting moves, it looks quite a pain to learn all of this. 

I imagine the next book on White repertoire for the big main Ruy López lines will be Negi. It is taking quite a long time for it to be published. I wonder why 

Hi, 

Just wondering whether I missed some important publication, or there really isn't one (like the long lack of a new black Najdorf book until the recent effort by J & J Doknjas)?!

I'm aware of tons of theoretically dense resources for the Black side (Bologan, Ntirlis, some older Sverre Johnsen work, the chess24 video series by Svidler on the Yurtaev/Neo-Arkhangelsk, etc), but the White side seems rather underrepresented - 
At least the d2-d4 complex does; with "Play the Ruy Lopez" covering the Worral instead of the mainlines, the Svidler videoseries on chess24 being about 6.d3, the german c24 videoseries by Huschenbeth looking at the Exchange, etc

Emms "Easy Guide to the Ruy Lopez" is excellent, but a bit dated at this point and rather superficial; the "1.e4 according to Anand" series exists, but it's also over 15 years old now.

My last idea was McDonald's Ruy Lopez Move by Move; it sounds like a strong book (I don't have it, just skimmed the sample pages), but from what I've heard it's more about general ideas than an 'actual repertoire'? 
http://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1315248478 dfan here says that above 1800 one might want a more theoretical work to support the verbal explanations - which would bring me back to the starting point.. 

Negi of course was the big hope, but that seems to either have fallen flat, or is going to take another decade, I'm afraid. Is there just no book, am I missing an important work, or is the McDonald's book "good enough" after all, and I could easily fill whatever gaps there may be popping up with a simple database scouring?

Thanks!