The whole point of using 4x5 is not only for the larger neg, but for the availability of various movements, esp tilts. It's hard to handhold something like that and get crisp results, though millions of images in the golden age of press and technical cameras were made that way.
But today, you're more likely to be looking at an upside-down image under a darkcloth. If you attach a high-quality 6x9 roll film back, you'll
still have the same working method, with the same advantage of camera movements, but obviously using a smaller film area which is harder to
focus upon and more nitpicky with regard to acceptable film choice, since it will have to be enlarged more. But if you can achieve a sharper
print than when working with any conventional med format camera, where you're only option for depth of field is either stopping way down
or resorting to ever shorter focal lengths lenses, which will change perspective to a wider field. I can easily spot the difference in my own
prints between 6x7, 6x9, 4x5, and 8x10 negs. But in any print as small as 11x14, I doubt the general public could detect the difference.