Only now realized on the Digital Foundry video that the devs don't mean you should use Spotify and just recommend it, no, they really already integrated that with a menu point.
That changes the whole thing for my demand and I think I will jump in and buy it. It looks so extremely much like B3, in even the smallest UI and font details, I just have to support that to maybe someday get more.
Also,
clarification time, cause Digital Foundry,
Dark1x , also got that wrong, you only need Spotify premium if you use the integrated Spotify music option. You don't need Spotify premium if you use the native PS4 or Xbox One Spotify integration that these consoles already have.
So start these apps, log into your free account, connect it with your phone and start whatever you want whenever you want. No premium needed and the music runs exactly the same like it would be Integrated in the game.
I don't know tho if the integrated version has some cool tricks like automatically pause the music in takedowns or menu transition and stuff, cause they could do something with an integrated version, which would be awesome, so that would get lost if you "only" use the console versions that you have manually to manage. But that's the only difference it could have.
But the point is, there is no Spotify Premium needed!