Uncompressed WAV files, lol I’ll never get over that
It doesn’t even make sense. Simple compression algorithms like in use by FLAC or AAC are pretty much free to decompress on CPUs from this century and the cpu cycles you save by not doing wasteful IO of huge files from storage easily makes up for that.
I’m sure game devs can make some argument to not use ‘expensive’ compression, but not using any is just wasteful.