I think many users can relate to this problem:
HDD space is quickly filling up with new media files. There are typically two solutions.
Either add a new drive to the pool(s) with all its cost and work
Or decide wich old files to delete.
At least for vidos Tdarr offers a third solution. Tdarr transcodes files into another format - for example the highly efficient h265 Codec. This compresses the files down to roughly 33% when compared to h264. It also alowes to reduce the quality (and thus filesize) for the files to a certain maximum level.
In short I think Tdarr would be a perfect addition to the Linuxserver.io repository.