Some actual first impression of the R7 (with first images)

2. Also, I have reports that the shutter button is mushy, and it is difficult to sense the midway to activate the autofocus, and ones ends up taking the photo before ready. What is your experience with this? Usually I focus on a bird, and I have to stay on it while gyrates to a better position for the photo. During that time, I keep the shutter button halfway (while balancing in one leg at the edge of a deep creek)

I am still waiting for my R7, so I can’t answer any of your other questions, but I’ll take a swing at this one.  I would suggest that you not use the shutter release for focusing.  Go into the customization menu and set the shutter release button for shutter release only.  Then set up one of the buttons on the back of the camera to focus only.  On my R5 I have two buttons I’ve set up for focus only.  One is for eye focus and the other is for whichever focus mode I have set up in my menus at the time, which I can quickly change from the control ring on my EF-RF adapter.  It takes awhile to train your muscle memory for this setup, and you will miss some shots in the process, but once you get used to it, it makes a huge difference.  You can find a number of tutorials online.  Google back button focus or double back button focus.  By the way, I usually have the non eye focus button set to single point, centered in the viewfinder.  When I see a bird land, I can quickly use that button to acquire initial focus, then slide my thumb over to the button I have set up for eye focus, and compose the image with the focus locked on the bird’s eye.