I may be wrong on this, but I thought some copy protection schemes relied on the transfer speed to protect the data. For example, Dungeon Master would not run on my a500. I phoned up the company (back in the day when they were in business) and they told me older floppy drives would have a problem loading it (I assume because of speed). I swapped the internal with a newer amiga external drive, and viola, it worked!
Fascinating idea, but I can't see how it could be more efficient than using a harddisk.