I don't know why you would, when you can save a nice chunk of money buying a used one in great condition, as I did. It was a second body for me. Just save as much as you can; these cameras don't fail that often so warranty isn't much of a concern. Why would you buy a new one when the next gen is right around the corner? Except, that corner keeps getting further and further away... lol.
I'm not being negative, I'm actually quite pleased because I am a habitual waiter when it comes to tech and I decided to stop waiting. I don't upgrade devices every year, or even every other year, but I either want the latest and greatest which is often right around the corner, or I want to save on the current gen so I want the next gen to come out to cause price drops on the current (soon to be last) gen. And boy, when the R5II drops, used ones are gonna be under 2 grand, an absolute steal for anyone looking for an extremely capable FF body with a high quality lens ecosystem (which is where your money's gonna go anyway). For me, I'm just happy that I can run a dual-body setup for my trips this year, and don't need to keep holding my breath.