A few observations:
One of the reason I bough the X-T3 is the tilting screen but I had it turned off after my nose sent some unexpected commands and it took me a while to get it back to "normal"
I spent some time yesterday figuring out how to better use the touch functionality, the ability to turn it on/off so that my nose does send unexpected commands while using the viewfinder is great
Also played with the connectivity to my mobile, it is a nice feature, but is it practical ? I do not know yet
I'm following a lazy approach to learn the camera, as I mentioned earlier, using it in manual mode is very simple, understanding the nuances of the automatic modes is more a curiosity , a bit annoying when I expect to see the exposure changing but it does not, or expect it to adjust automatically and it doesn't, so ... I end up in manual mode often, I have to understand better the exposure compensation
I expect I'll eventually use it in a studio, I'll have to remember where to tweak the live view so that it works as an optical viewfinder without displaying the image that will result from the exposure settings.
I like how the focus area can change size by moving the command dial
Battery life is not so bad, I was expecting worse
I found the menu to reprocess a raw file in camera, I thing often do in the D800
AF is able to lock in conditions where it is very dark and I do not distinguish details, that is without the use of the AF illuminator