It really depends on the usage, I’ll admit that. I will also admit that I don’t specifically want the sensor of the R3, it’s just that its feature set checks all the boxes.
First of all, let me say that I enjoy shooting silently, and shutter vibration free.
Then, there’s motosports photography, that I do sometimes and, because it involves both subject and camera movement, is very prone to rolling shutter.
Then, 14 bit RAW with electronic shutter.
Then, flash with electronic shutter.
Then, high frequency anti-flicker would be amazing for live concerts, where even the mechanical shutter will suffer with banding from the LED lights, on high shutter speeds.
I currently shoot mostly with electronic shutter, on my R6 (the original), but I have to be mindful of when to change to the mechanical.