This is a nice thread.
My contribution follows...and what is being discussed here is most similar (to me) to buying a computer.
I'm writing this on a Dell XPS 13 9380...in a couple of months it will be five (?!) years old.
It is my daily (portable, less than 3 lbs.) driver and is extremely useful for travel. Still a Windows 10 device that runs a legacy version of Photoshop.
As purchased, it has enough RAM and SSD space (along with a high-quality IPS touch screen and first-rate touchpad) to keep me happy running Photoshop, Picasa and the Topaz suite of image software (the Topaz video app? Not so much...).
Yes, the Intel processor is several generations behind...but it is good enough for my needs; I am not worknig near a press box or stadium where speed is of the essence.
Had I gone for a less-expensive laptop (or the same one with less RAM and SSD space), it is likely that I would have purchased another laptop months ago. But no need...I bought right. My goal is to buy right again, later this month...with Canon.
About a dozen years ago, I bought my first full-frame Canon--the 5DMkIII. I still use it. Nearly daily. I have purchased the M6MkII and an EF/EF-M adapter and the sensor inside the M6MkII as well as the body's capabilities have served me well also.
I regularly post images obtained using both of these bodies on CR--a few are kind of nice.
But it is time now to 'upgrade'.
From what I've seen and read on CR and elsewhere, I think the R5MkII has the best chance for satisfying my needs...for another decade+.
I could wait for the R6MkIII...but I'm on the list for an Aug 20 delivery and hope to report back a few days later.
And also hope to live long enough to be enticed by yet another Canon body years from now!