The mirrorless stuff is seductive, but it holds little appeal for me. I have looked into it on several occasions. But I still use the optical finder and find it much easier to imagine what a large print would look like using it. I can't focus closely enough without a loupe to allow an external screen to appear the way I want a print to appear--with about a 45-degree field of view from the viewer. The EVF's with eye-level optical magnification look better, but I still have to depend on unrealistic software tools to tell me when the subject is focused. With a proper focus screen, I can see it in an instant on actual ground glass.
My small-format DSLR (a Canon 5DII) is now quite old, though it was recently overhauled by Canon with a new shutter and mirror box. My main camera is a Pentax 645z, which is also getting rather old in digital years, but still produces such stunning images that I am nowhere near ready to replace it. And its optical focus screen gives me that sense of looking at a large print from up close. And I don't have to buy multi-thousand-dollar lenses to be able to make prints large enough to encompass the viewer's field of view.
Cell phones, and I use mine a LOT for making photos, work great for merely documentary stuff that will be seen on another cell phone, or at most in a constrained window on a computer monitor. I can't make prints from my iphone 8 any bigger than about 4x6" before I get grumbly.
But then I'm sort-of agnostic to format: Ansel Adams claimed to use the largest camera he could carry. Sometimes that was an 8x10 large-format camera, and sometimes it was a Hasselblad, Zeiss Ikon, or even Leica. I can still hike all day carrying that Pentax, so that's what I do. If I happen to make a worthwhile photo (and it happens once in a while), I know I'll be able to print it very large and still meet my objective of sustaining the illusion of endless detail. In digital, I have everything from a cell phone to the Pentax. In film, I have everything from half-frame to 4x5".
Rick "not the first time market fads have ruined my favored use cases" Denney