Can you elaborate on why you're buying a professional camera and then not use the manual capture modes? Since using DSLR/DSLM I've never used anything other than M.
Because the camera is faster and smarter than me in most cases w/r/t what the settings for a given scene should be? A lot of what I shoot is run-and-gun, I'm inside, outside, inside again, lighting changes. I guess if you're shooting on a tripod indoors with consistent lighting then M makes sense, but if you're not, you're wasting a lot of time measuring or guessing and twiddling, when you could be just taking the shot. Honestly I would pose the question back at you; why have an R5 if you're going to shoot 100% of the time in M? Go get a digital medium format camera at that point; the R5 is a portable computer with a lens mount.
I generally shoot in Fv because I can quickly change from locking down 1 aspect to another, or 2 to 1 and back to 2 again. For example, if I'm not worried about stopping motion, I set lowest ISO and preferred aperture and let the camera decide shutter, because I already have it backstopped in settings not to go too slow. Or if I am worried about stopping motion, I set the shutter, aperture to the widest, and let it determine the ISO as the clouds roll in and out. And I like the R5 over other options because I like having 45 MP to crop, and I like having an optional grip rather than built-in. Another feature I hope the MK II has is better battery life, so that I don't have to use the grip as often. And I assume it's a given, but I hope it has the new hot shoe too. I do also use my R5 in conjunction with a Ninja V+ for video.
A+/Advanced A+ just gives me one more option, and one that gets me from "off" to "captured image" more quickly, meaning one more scenario where I use the camera instead of my phone to take photos, allowing me to "be in the moment" more, and focus almost exclusively on scene composition and lighting, not camera equipment. Honestly, if I could hook up my phone's software (Pixel 7 Pro) to my camera for image capture, that would be the ideal for me...I tried an Arsenal 2 Pro as the seeming middle ground for this, but it was too clunky and the features weren't as fully baked as I would have liked.