The Dolphin emulator wiki keeps a list of GameCube and Wii titles that shipped their retail releases with debug symbols included. [1]

It'd be painstaking reverse-engineering work, but I'm curious if more games in the future could have these sorts of "clean room" decompilations, provided the compiler toolchain can be realistically approximated.

[1] https://wiki.dolphin-emu.org/index.php?title=Ships_with_Debu...