Huh? See 5Ds. It was contemporary with and essentially the same size and weight as the 7DII, and in crop mode delivered the same 'reach'. But keep on living the APS-C dream!
You must take wildlife photos in a zoo! Reach is by far the most important reason most wildlife photographers desire APSC. Not all of us can afford an RF 600 F4 lens.
I think that they have decided to let Sigma handle that for them. The only things Sigma needs to add are a small and light 50-135 f/2.8 and maybe the 70 macro ported to R mount, I use the Canon 100-400 and adapted Sigma 150-600 FF lenses on the R7 and I can't see why converting them to APS-C would improve them. (Recall that the size and weight of long lenses is dominated by the focal length and size of the front elements.)
Here's what you need to do. Get yourself a Xiaomi 12T Pro smartphone, which has a 200 MP camera with 0.64 µm pixels. Put it behind this $90 20-40X phone camera zoom lens:
