[davidmanze]

...And because the AF misses are due to different wavelengths focusing differently, and lenses do not have the same aberrations over the whole focus range and even less so over the whole zoom range, AFMA is even less helpful.

    I'm not sure what world I live in ..... and I don't have any super optical technical knowledge ........ but you always come up with theories, (which could be technically right no doubt)  ..... that I struggle to align with my own experiences. 
Nikon has not a flawed system..... and as JoJu says ..... most of his lenses needed AFFT and the result is fine ...... so all I can conclude is these theories just don't apply themselves in any meaningful way to my shooting.
  If DSLRs didn't have AFFT I would have dumped them years ago!!
  --
 JoJu, the Tamron has trouble at 600mm@ F6.3 to achieve focus on the outer corner points (D500) .... this is normal ....... not great, but normal.