Why convert FLAC to WAV?
FLAC is excellent for listening and storage because it saves space. However, it requires a decoder to play.
WAV is the raw audio data itself. It is the "lingua franca" of audio software. If you are trying to import a song into an older video editor, Digital Audio Workstation (DAW) like Pro Tools, or hardware sampler, it might reject FLAC but will almost certainly accept WAV.
Converting FLAC to WAV unpacks the file to its full, original size, ensuring maximum compatibility without altering the sound.