I think often the binaries will have been compiled against slightly different versions. With dynamic linking, I can swap 1.0.1 for 1.0.2 or 1.0.3 without issue. The hash would require an exact match, which is likely rare.
I want an exact match. That is what I developed and tested against. A change, however small, can have unintended consequences. Changing versions is a huge issue from a reliability point of view.
