To be fair, though, that's 100% Spotify's fault. I remember when there was a watch app for Spotify and Spotify bought out the company and removed the app from the App Store. Now, they refuse to release a new app because of their little dispute with Apple regarding purchases. Makes me hate Spotify because it only adds to the list of really silly things they've done that spites customers but might make them a few dollars in the long run.
There are no 3rd party apps that can stream over the cell connection or Wifi on the Apple Watch. Pandora, Tunein etc. Some can do offline. Pretty sure Apple only allows their apps to use the cell connection for streaming because thats an Apple thing to do.
That's not true. Spotify purchased an app that did just this by buffering into playlists that updated while they downloaded and then they promptly killed the app. WatchOS 6 also includes the ability for third parties to stream directly and Spotify has publicly said that they refuse to use this until Apple changes their App Store policies.
It's completely do-able and Spotify has the capability to do it, now and in the recent past.
