My car is eighteen years old, so not the latest gadgety model. I think my friends laugh at me! But cars are so expensive and why replace it if it works? The gadget I bought for I think might have been about ten or fifteen pounds? You just plug into the cigarette lighter and then it makes the music from your phone play through your car radio. Amazing! I only started using Spotify subscription service a few months ago, but have used it a lot. I've been going to see a lot of live music (I think Lord of the Lost from Eurovision are likely to take out an injunction if I turn up at any more of their concerts!) and so I have put the bands I'm seeing setlists on Spotify to get to know the songs before I go.
I also like being able to mix songs, like you. I lost my original Spotify ID, but used to have loads of lists for working out, feeling sad, musicals, etc. and have got quite a few on the go at the moment. It reminds me of the old mix tapes we used to do on cassette, but much easier!
Yes, I've had that issue with things I want to see no longer being on streaming, and me no longer having the DVD. So it definitely makes sense to keep them if it's something you know you're going to want later.
Hope the job is going well!