Transcoding Opus to FLAC does not improve quality. It changes the container. But FLAC is useful for editing, mixing, or archiving.
: If you plan to edit the audio later, starting with a lossless FLAC file ensures you aren't compounding compression artifacts. yt flac best
He didn't just hear the music; he heard the room. He heard the bassist’s sleeve brush against the wood. He heard the drummer’s intake of breath before a cymbal crash. It was impossible. YouTube’s servers didn't hold this much data. It was like finding a gallon of water inside a thimble. Transcoding Opus to FLAC does not improve quality