The "full compatibility list" for USB Loader GX generally refers to two things: the physical USB storage hardware (hard drives and flash drives) and the game software
The issues weren't just code; they were hardware. The Wii was never designed to read games from USB 2.0. The early homebrew coders had to trick the Wii's DVD drive microcode into looking at the USB port instead. This caused timing issues, stuttering cutscenes, and anti-piracy triggers. usb loader gx compatibility list full
All other GameCube games are fully playable via Nintendont and USB Loader GX. The "full compatibility list" for USB Loader GX
: Follow the USBLoaderGX Wiki for the most stable cIOS recommendations. usb loader gx compatibility list full