They've made the entire process seem much more complicated than it needs to be; starting the process, then deciding that the canvas size should be changed, then having to start over with the selection, but in the end the result is the same. There is degradation in the image from the transformations done in the computer. Not sure there are many people who don't know that, particularly those who do this kind of work as a part of their photography business. Not a lot of people, I don't believe, are still doing this type of work with large format cameras. I think most of it is being done now with medium format and DSLRs. But there are other considerations. Cost for convenience, or affordability. A Schneider 24mm T/S lens is over $2k, so is the Canon 24mm and the Nikon 24mm is right at $2k. That's a lot of coin for a lot of photographers. Some likely can't charge enough to justify that kind of cash outlay. Time is also a factor. Is it quicker to do it in the field or on the computer. What are the images going to be used for? Will the degradation from making the adjustments in Photoshop be sufficiently evident that the images will be unusable? It's absolutely true that using a T/S lens is going to produce a better quality end picture. But there are lots of other considerations.