The Daily Mixes do contain a lot of songs you have in your playlists, especially in the first hour of listening.
From my experience the Daily Mixes get considerably more interesting a few hours in. You can try (on desktop at least) hitting play on the lowest song visible in the list, wait 'til Spotify loads more songs at the end and repeat the process a few times. :)
Recommended Songs at the end of playlists are often more interesting though, as they must be songs not in your playlist yet.
Have a nice day and I hope this helps :)
SebastyRock Star 16
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