I know that this idea has been raised a year ago but it was closed (not declined) and I am still frustrated, that this feature is not implemented so far.
As a DJ using djay2 app from algoriddim with spotify premium integration (djay2 integration is the reason why I am still a spotify premium member who pays) you often have the situation, that WiFi/WLAN is not available. I know there are some workarounds by using a cell phone as wifi hotspot, but to be honest: you cannot rely on a wifi connection as a DJ. The best way to DJing is to own the music or to have it offline for the case a streaming service like spotify is used.
On the algoriddim forum page there is a another discussion running regarding this feature and the feedback from algoriddim djay2 developers looks like that spotify has to provide some functionality in such a way that algoriddim can make it happen.
So I am looking forward to other DJ's in this forum that might vote for this idea again - and hopefully we get the 100 kudos for a review which may end in realization...