The left eye problem deals with cameras which lack a joystick and are asking photographers to use their right thumbs on the touch screen while looking through the viewfinder to move their focusing squares. The left eye problem is not unique to Canon, the Sony A6400 has the same issue, as well as a few other cameras. The reason Im picking on Canon is because I have seen this 3 times now on the Canon R, RP and M50.
200/566 users polled are left eye shooters. Ive heard from several of them who have returned their cameras over this accessibility issue on these Canon cameras. 1/3 is a big chunk of customers, so Canon may want to reconsider this design problem.
BTW- I really like the RP overall and am keeping mine for 1 specific reason Ill discuss in an upcoming video. Its a GREAT camera.