I have an iPhone. iPods are obsolete.
Obsolete means that there is no longer a need for them. Since iPhones can only hold a fraction of the music that an iPod can hold, I would argue that iPods are not obsolete. They serve a purpose which is not otherwise filled.
There isn't a need for them anymore. That's why they're going away. iPods came out before there were streaming services. Now, I can listen to more music on my phone than any iPod can store. It's not about memory storage anymore.
I only utilize Spotify to listen to albums or songs I don't feel like buying.
But the songs I do have cds of, I ripped onto iTunes as joined tracks, like the entire Theory of Everything album. I joined those tracks into the 4 phases they're broken into.
There's also songs that are not on Spotify, such as the many OC Remix songs I downloaded. I have made playlists including those songs. Also, there are songs in those playlists that are not available on Spotify due to copyright, such as Janelle Monae's song with Prince, while the rest of the album is on there, that one song isn't. Superior is a band that is not on Spotify either.
I got rid of my iPod a long time ago because it broke and there wasn't any other iPod that had the same amount of storage.
I moved on to find a device that does have a SD card slot so I can just remove them when the device dies and get another one with an SD card slot and continue playing my music, without having to import them all again, like the Ipods.