Well it appears that TOSEC hasn't quite completed their datfiles for like Game Boy Advance, SNES and some other Nintendo systems, but they still have a huge set of dat files. They even tagged some bad dumps mainly for the Commodore 64 and Amiga as those tapes and disks aren't as robust as those ROM cartridges. Besides we may not know which ROMs are corrupt that can give out a irrevelant bug report to RetroPie as those bad dump ROMs are not wanted.