The list of cameras with inbuilt focus stacking would be really short, but I might be wrong on that. Sony? Pentax? Olympus? Would be my list to search for that feature in a camera.
I just think how long it took Nikon to put in the comparatively simple technique of adjusting AFMA for PDAF by using LiveView focus positions. They are not exactly flooding the market with these kind of inventions. So I also think, Nikon waited that long with focus stacking because they are not the fastest company, not because of concerns against focus breathing
Anyway, I don't recall any problems with reallife focus stacks, so I remain highly sceptical about the role of that constructed issue. But I also used to take care of the backgrounds. Which is easy because due to the needed software and computer (so far) it's more an inside technique, less so in nature. Although there are people using it on insects.
It's a real shame that some people jump straight into the negatives and not marvel at the positives. And I don't necessarily mean here on PZ.
For example, no one that I'm aware of has mentioned 8K timelapse.
This is mind boggling if you like the Ken Burns effect. It means that you can do say a 10 second timelapse where you can go in any direction - left, right, in, out, sideways - wherever you want without losing ANY resolution for HD. 4K, I'm not sure but I don't do 4K anyway.
Other things like the joystick for AF which was previously only available in the D4/5 series. Not to mention the best-ever view finder!
Truly amazing things for a $3300 body. Yes I know it's US$ but the good wife is in the States at the moment. I have to somehow get her to stay there but I doubt that the cameras will ship until October.
There's no big choice when it comes to cards. I could not find SD cards fast as XQDs at writing speed. But these beasts are expensive, gosh! The SD cards have the advantage that there are tons of readers out for them. I have no clear opininon about that, the D810 also has mixed slots. And the D850 only wil be as fast as the slowest card...
Well, yes, that's the issue, fast, but terribly expensive. And limited selection of readers.
I'll probably stick to SD for a while...