We don't know why it took so long for Spotify to introduce swipe -to-queue for android devices.
Right now first users are reporting that the long awaited function is available for android and it works really good.
Swipe to Queue is a simple and easy way to add tracks to a Spotify queue with a simple gesture.
The feature was available for iOS for over a year right now and if finally coming to other devices.
If you didn't receive the update yet, please don't be afraid the files are coming, but some testing might be required at the start.