There's some reasoning in this thread: https://old.reddit.com/r/emulation/comments/7p2rik/redream_h...
Notably, this comment by the developer (with followups): https://old.reddit.com/r/emulation/comments/7p2rik/redream_h...
Notably, this comment by the developer (with followups): https://old.reddit.com/r/emulation/comments/7p2rik/redream_h...