Thanks for reaching out about this here in the Community.
We moved your post from the Ideas board to the relevant Help board, where it fits better.
You can already organize your playlists in the desktop app or web player by following the steps here. No worries, they'll appear on all your devices.
If you think your idea should be considered as separate, feel free to submit it again highlighting how your idea is distinct from the existing option.
If you need a hand with anything else, the Community is here for you 🙂
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“Music acts like a magic key, to which the most tightly closed heart opens.”– Maria von Trapp