On the WAV files I have found apps to put the cover art on. Takes way too much time, but what's an album without the cover art. Either on the computer or phone. I like the WAV files because I have them set uncompressed.
A WAV file is just a container, after all, like any other file, so as long as the player understands the tags they can be added. It is more common for WAV files to be raw while MP3s and FLACs have id tags. For my Japanese albums I even added English lyrics using a tag editor and Roon can display those.
I also take the time to add album art for every album.
Exact Audio Copy is pretty good at connecting to public databases and displaying available album art to include with the rip, but if it is low resolution I will search for a better quality image. You only rip a CD once, usually, so while the CD is ripping I will grab the album art. I prefer FLAC as it is lossless but still considerably smaller than WAV so albums copy to devices more quickly and take less storage. When you get to have several gigabytes of music the space savings are significant and it speeds up backups as well.
