"Common sense" when you completely ignore the fact that Canon was the market disruptor in the first place. Canon launched the R5 at 20 fps, 45 megapixels for $2500 less than the A1 came out after the fact. Canon knew what they were doing when they made the R5. And they definitely knew that the R5 was the first shot across the bow of competitors in building high speed, high megapixel cameras.
The R3 was always built to be a response to the $4500 A9 sports camera, not to be an actual flagship camera.
It's like saying that Sony has completely obliterated their own A9 by releasing the A1. That's just not the case whatsoever. There will be an A9 Mark III and it will continue to have a place in their line-up. There is a market for low MP, high FPS, high buffer cameras and will continue to be. Everyone in the market knew that this was the way things were going, and Canon knew that when they released an A1 competitor for 2500 bucks less before Sony even had the chance to announce their version of it.