This leads me to the conclusion that the 280 $/EUR 4000D with kit lens is a camera for more advanced users than the EOS RP because it has these modes.Actually there is. The person who is taking the video may not have the skills to pan or crawl the camera well and the end result may look stuttering on the TV or monitor. Just check Red Pan Calculator that says the time for 24p and 30p or 60p for a given focal length for a smooth panning shot is quite different and if you don't do it right (average video shooters do not get it right) your shot will not look good. 60p and 30p are more forgiving than 24p here.
I think "panning compatibility" is absolutely not the reason to omit 24p. And if a user uses EOS RP as beginners camera there is the "beginners menu" setting in all "lower" camera models which provides additional information about settings.
IMO there are only two reasons to omit it:
* some programmer has accidentally commented out the line which defines the mode
* marketing decision
finally I cannot understand the missing 24p (and non-existence of 1080p with EF-S)