I would replace the word "professional" with "perfectionist" - there are plenty of non-pros who want to achieve "professional" results and the highest possible keeper rates. And to refer to people who demand the best results as "posers" is ignorant and insulting.All this discussion about "its a bad camera because ibis is missing. I am such a professional, I need an uncompromised video and photo tool".
Just keep one R5 and buy one R5C. Thats the perfect solution. You have the perfect photo camera with great video features with ibis, in case you realy need this.
And you have one more video centered camera that offers unlimited recordings and everything one can wish for, except ibis.
Yes, that would be the ideal solution, but there are many pros who haven't yet built up their business to the point where they can afford to buy both cameras. Further, there are many established and highly respected pros who like to keep their expenditure on gear quite low - e.g. Keith Cooper of Northlight, who uses an R5 as his main camera, and a RP as his secondary camera.