Is this thread about cropping? It's hard to know but I think it once was at least. That original subject does interest me.
I think the idea of not cropping is that for the image to be real art it should be experienced ("felt") and captured at the scene. Cropping in post-processing is retrospective and a sort of manipulation of the original experience. I also think it's a sporting element to it, that a skilled photographer should be able to frame right in the moment, and not cropping is a way to show how skilled you are.
The key problem with not cropping is however that some compositions work better with other aspect ratios, and some compositions require a specific camera location and you may not have the right focal length to get the framing you want, so you need to shoot wider.
I'm no purist in this regard and I don't really care how people choose to do it, but for my own photography I have noted how much more pleasing shooting experience it is to frame it right on the ground glass and have the finished image when the shutter is pressed. I carry seven lenses with my tech cam which is more than most, and the reason is that it gives me a more pleasing shooting experience when I can frame more precisely. My camera's aspect ratio is 4:3, and I'm glad it's not 3:2, as I'm not so much into panorama framings but more 4:3 or 4:5. When I do a different aspect ratio I generally have it planned at shooting time, although the choice between 4:3 or 4:5 is quite often done in retrospective.
Today's tech cams is a natural evolution of large format and you shoot in the same way. However it seems to be changing towards more focus stacking, fewer heavier and more expensive lenses with the inbetween field of views handled with cropping, limited shifting and instead keystone correction in post. To me this takes away some of the essence of what I want photography to be. To me the shooting process is important, it's not just about the end result. It is in this context I see cropping, which certainly is not forbidden in my book, but it's not entirely uncontroversial.
It's also worth noting that when you present a work as a series of images it's easier to make it look good if you have the same aspect ratio on all images and I see many do that. I've chosen to not do it though as being able to choose aspect ratio and landscape/portrait orientation depending on subject is a key element of my shooting style.