The R7
does have Pre-shooting, although 0.5s is not always enough (1s like the Z9 & Z8 are offering gives a bit more room for reaction, if you are slow, but the Nikons don't record RAW-files, only JPEGs...). Unfortunately it is hidden in the menu under RAW burst mode and is not deployable as a single button action via Custom Functions which makes it not very useful especially in situations (such as wildlife has plenty of) where you would want to activate this setting quickly.
Here's the link to the manual for those who are not familiar with the feature:
The R7 has other major drawbacks such as its "unique" button layout (no other Canon EOS has the same scheme; the EOS 7D, 7DII and 5D models had all the same universal button layout which was extremely comfortable when using different bodies - except for the EOS 1D series which was and is always something special), it has a very loud mechanical shutter (almost unusable for shy wildlife) and a slow electronic shutter, no option for a separate battery grip (like the EOS 7D & 7DII had and all the EOS 5D models had and was extremely handy with long telephoto lenses) and - as you mentioned - the lack of a powerful & intelligent AF-system (which could have been at least partially addressed via Firmware updates, but that never happened and this shows the low priority the R7 has at Canon).