Simply because most members are from USA and this console sold very bad there.
Weirdly enough, it's the same for the Genesis / MD whereas the console sold quite well. I suppose it's because Genesis players were attracted by the console for its western games, and are not really fond of the unstranslated games (mainly RPGs and strategy).
I think it part is because, from what I've read, Genesis games were more often heavily compressed than NES and SNES (perhaps in part due to its faster and more complex CPU). During the developmental years of ROM hacking, that was enough to turn people away as few people knew how to do ASM hacking. They'd be like "oh! compression! game is unhackable!". Tools developed more for NES/SNES games and emulators I see got better for them.
(I know SNES has compression too, but like 95% of the time, from my experience, its simple LZ variants. I've seen the "standard" Genesis compressions docs and it doesn't look like they'd be too easy to crack manually.)
Now, there are some nice emulators for Genesis, but I don't know if there's one that still has a nice trace-to-file option. (except for GensTracer, which I had to use for Nadia, but having to edit the text files each time is a very clunky UI