Yes its always nice to have the option of running your new exec.library on our minimigs and A500s with harddrives.
Also, some users may want to have a dual boot OS3.1/3.9 system. Since the 68020+ opcodes are created and used only for certain functions the only benefit a 68020+ exec.library is saving a few more bytes of code.
... and Cosmos would have a pretty good idea of how many bytes could actually be saved.
