What does it matter what I think? I don’t care.
For the record, and because you incessantly turn everything into another question: I have an R1 and I love it. It’s a great camera. By a long way the best I have ever owned. By a long way the most expensive I have ever owned also. Until then I used, professionally, dual 5dii’s, then dual 5diii’s, then dual 5div’s. Every one a great and durable camera that enables me to earn my living from shooting with them. Never once have any of those cameras failed either durability wise, or technically wise.
Now I use the R1 with a 5div. That 5div has been the same camera I have been using since I bought it, nearly TEN years ago.
Yes. They’re certainly extremely durable and yes, they’re built to the same standard in my experience (or as close as feasible for the cost difference). No, they’re not flagship cameras.
Now you. Have you professionally ever shot, day in day out, with any 5 or 1 series? Have you ever had any of them fail on you?
Now, you don’t have to be a professional, I’m not being a snob, but that’s a sure fire way of understanding just what a camera can go through, rather than whatever it is that you’re doing.