Platform pages matched emulators to systems by the exact id, so the RetroArch page listed none for sega-mega-drive (genesis_plus_gx says sega-megadrive), and listed every emulator of a system instead of those the platform runs. Emulator cards linked only ids a platform uses: 2,057 of 4,215 system lines had no link, now 327, the rest having no page. Ids are compared as _norm_system_id reads them, and a system only profiles name is placed by the files they file under it.
Abdessamad Derraz