I don't have a problem with the R5. I'm referring to the 6 series. 2 year cycle is very fast. We just got a second generation R5 while R6 is about to get its third.
R6 is less expensive and more mass-market. It makes money for Canon. On the other hand, competitors don't allow them to relax. It's kinda driving in traffic — you ride at the same speed or you stay still on a shoulder.
Read again. We’re talking about a variant of the R3’s sensor.
Another 24MP full frame camera? While even APS-C cameras are now at 40MP and Sonys direct competitor sits at 33MP. I'd prefer if they sacrificed some speed and gave us 30MP, I'd probably even sell my R5 for that.
Regarding the 2-years cycle: Yes it's too fast. Canon always had a ~4 year cycle for every model. I don't want to end up in mobile phone cycles where you get a new phone every year with lackluster improvements. But it currently seems that this is where we're heading: Milking the G.A.S.-crowd 
The a7 IV only competes with the R6 series in price. They’re fundamentally different cameras.
I’ve become fond of a useable electronic shutter with the 1/61s readout of the R5 as minimum (or maximum). The 1/31s of the R7 is too slow for my use case, the 1/68s of the R8 being pretty good.
