Ah, another thread with the usual suspects seemingly bewildered about why anyone would want a crop body rather than FF. To summerize their arguments:
"Just get an FF camera and crop when you want the reach." I have a sneaking suspicion that this new $799 FF camera will not be a high MP camera. It might be 26 MPs like the RP, which would give it 10 MP in crop. Not quite the 32 MP that Canon has in their 90D and M6 II - and presumably in a new RF crop camera. So far less pixels on target in your "superior" FF camera, but I guess that doesn't matter when you are just arguing on the internet.
"Just wait until the high 80 MP (or more) FF camera and crop." A better argument except there still is no such camera. And when that camera does appear, how much do you think it will cost? I would guess at least as much as the R5. So, beyond affordable for many folks. Yes, if you were to give me the new 80 MP FF camera, I would take it instead of a 32 MP crop that costs 1/2 as much (or less for a 90D level RF crop camera). But if I have to pay for it myself, then the crop camera will almost certainly be the better option.
"Just crop..." Another thing that people who say this don't seem to understand, is that it is not always easy to get your composition correct when you have to judge where your "crop lines" will be. And composition is arguably the most important factor in what constitutes a good photo (In the art world, "Design" or "Composition" are usually atop every poll on the subject of what is the most important aspect of a painting). If you can compose your shot using the entire viewfinder it will always, without exception, make it easier to get your composition the way you want it.
I won't even get into DOF, because whenever I mention that some people want more DOF, and it is easier (again due to cropping and composition) to get your shot with more DOF with a crop camera, it seems to go completely over the head of the "FF is always better" crowd.