Why bother with SDD-1 at all when you can just patch both games to not use the chip? Seems like a waste of resources to emulate it just for two games.
OBC-1 was used in only one game, and that's implemented. What's your point?
The person who did the Star Ocean patch is no longer in the ROM hacking community and someone has already completed the core for this.
I'd rather this be implemented for future proofing, in case some hacker somewhere (looking at you SMW Central) makes a hack that utilizes it.
Don't like it? Then don't copy the bitstream file and don't complain when other people want to play games that use it.