That is exactly the point. Before you had 1D for speed and 1Ds for high resolution. Both were housed in beefy pro-grade bodies, with large batteries and top notch (at the time) focusing systems. In fact, 1Ds had almost three times more resolution than 1D. It was like that until Canon abandoned the high resolution 1Ds and basically renamed 1D to 1Dx, with the benefit of giving it a full frame sensor. From that point onward, there were no high resolution sensors available in series 1 Canon cameras. You only had high speed + full frame + modest resolution.
With R3 it seemed like Canon was placing R3 as a sports / wildlife camera and keeping the R1 title for their high resolution camera. Instead, R1 is basically R3mkII. If you compare Canon's history of series 1 camera, there were always 2 versions available. Nowdays if you want to shoot high resolution, your only Canon option is R5, which is not the flagship (R1), not the runner up (R3), but rather a third place camera.
And while I love my R5, the body is simply not at the level of R3 or any of the previous series 1 cameras. It's just not. I could live with that if the upcoming R5mkII was at least bringing 60 mpix to the market. Instead it's 45 again. That is a let down.