My understanding of the value of a snip test is more to dial in a specific roll or sheet, than as a testing tool. For example with where there is some question about how to develop E6. I have not done snip tests from rolls because I have not had anything I was that worried about. (And typically if I make and exposure error it's normally a big one and adjusting development isn't going to fix it.)
For 4x5 I do shoot two sheets for important shots but that is more about dust or blinking subjects.
For testing 35mm film, since I hand load, I just roll a couple short rolls.