Canon may get to second base with the R3, but 24mp is still a bunt.Because the professional sports photographers they surveyed when designing this camera didn't want 45mp or more. The person this camera is aimed at has the glass they need for the venue (i.e. they don't require heavy cropping); needs to move, edit, and publish files as fast as possible; and doesn't normally produce 36" or larger gallery prints which require immersive detail at very close viewing ranges.
I've said many times that I love high resolution 35mm imaging and would not personally want to go back to a lower resolution. Never the less I am surprised at all the hand wringing over Canon's choice here. It makes sense for this market segment. People are acting like 24mp is 4mp. It's not, and if you're not cropping heavily or making very large prints then 24mp vs. 45/50mp isn't all that noticeable or relevant.
This is 24mp with Canon's newer, better AA filter design which likely means overall IQ comparable to a 30mp 5D4 or R. (The latter will still resolve more but the former will be sharper ooc.) It beats the A9 models and can hold off the A1 until Canon releases an R1 for the niche that wants speed at a higher resolution.