I would be fine sticking with such limitations personally if I was planning to make a game for multiple platforms, if it meant that I just had to code the game once or only modify a few things thanks to a library.
Also I would advise anyone against making a Sega CD-32X exclusive homebrew, because both add-ons cost like $200-250 with the cables included in total and I doubt that many people had both at the same time. That's unless both can be emulated at the same time (I forgot). It would still be nice to see the CD and 32X power used to their max potential at the same time.
And that sucks about MiniLD 71 D:.