If you release a camera which has similar features as other cameras, eye AF, so many fps, whatever, then you normally expect the camera to work in the same way as the opposition. If they then have a load of clauses in there so that they don't work as expected, then that is not being genuine imho. And then if you say that some features will be improved at some point later down the line then to work as you would have expected in the first place, for me, that is not the same thing as adding features which were never mentioned at time of release. If I read that a camera had 8fps, then I would expect 8fps with Auto Focus and Auto Exposure, especially in a mirrorless camera in 2018.
Nikon, afaik, did not say to prospective D5 buyers, here are the focusing options, and btw we will add another one in a couple of months. I don't think at any point during the release of the 7D did they say at any point that in the future a firmware update will give "improved continuous-shooting buffer depth (to 25 Raws, up from the original 15), customizable Auto ISO, control of audio recording level for video and the ability to re-process Raws and rate images in-camera. The update also enables the use of the GP-E2 GPS module".
If I read that a camera had eye AF I would have expected it to work in a similar way, though maybe not as well, as Sony, not
'we have eye AF, (
but not in continuous focus, and not in a burst mode)'. Yes, the manufacturer may say somewhere that this is limited to this, and that is limited to that, but it is the headline which has got the attention.
You may be quite happy with that, but I expect features to work as expected without too many caveats buried low down in the spec sheet. Imho both the Canon and Nikon mirrorless cameras have been guilty of too much of that with these releases. Again, you may have a different view, and that is of course fine.