I almost never look at full images in 1:1, either, but I find very often that I have the wrong lens for an application and/or the wrong exposure. You don't hav

I almost never look at full images in 1:1, either, but I find very often that I have the wrong lens for an application and/or the wrong exposure. You don't have to go very far before you've cropped a 20 MP source image into a 4K or 2K image, and if that part of the image that you've wanted to highlight is not well-lit, well, exposure is logarithmic and I want all of that RAW color depth that the camera can find if I'm going to turn black or white into perceptually accurate colors. It's true that when my framing and exposure are great out of the box, I probably wouldn't notice or care if JPEG compression cut my file size by a factor of 4...but that's not always the case.