yt-dlp supports downloading playlists. By using the --archive option it can save all downloaded video ID's into a text file and will only download videos which are not in that file.
I wrote a docker container with a friend that uses that mechanism to auto download new videos every time it is triggered using cron. The configuration is a bit rough though and there is no gui so if this supports that part as well I might switch.
Please for the love of god, someone go and build an electric car that is as dumb as possible