Canon 1 series professional photographers shoot both indoors and outdoors, so they need bigger pixels for low-light performance. They also need speed - processing and offload to media (so dual CF- E USB 4.0 cards that can transfer 3 GB per sec!). Shooting indoor Olympic events or the press events and medal ceremonies require no more than 24 MP to 32 MP. 4K video at 120 or even 240 fps would be better for slow motion than any 8K video - nobody views 8K video content on their smartphone or tablet anywhere in the world. The Canon R1 will be used by pro photogs at France 2024. These folks with 600 f4 or 800 f5.6 lenses care about speed, AF and DR. All Canon have to do is include an AI chip alongside the new X2S processor (or whatever they will call it) for improved AF subject recognition (like Sony have done with the A7RV), or...if they have developed QPAF (we still do not know for sure), then that would be a game changer.
As an R5 user I am happy that the R1 will be released before the R5II, that way, it shall share some of the new tech (presumably same processor, similar AF etc.), and moreover I am ecstatic that my old R5 is still the flagship

Canon mirrorless body!