I would like to request optimizing the Spotify app for 18:9 screens, such as on the Pixel 2 XL or OnePlus 6.
Please also understand that not all Android builds are alike, stock Android doesn't have any option to force optimization like the S9 does.
Even though phones with this ratio our out for over a year now, Spotify still didn't update their app to support this, even though Apple Music (Yes yes, Apple, the iOS developer) supports it for a while now and even though Spotify updated the app for the iPhone X within a month.
The optimizing would make the black bar dissapear, which is even more apparent on Android P when entering the multi tasking or lowering the notification shade (screenshots attached).
Also, coloring the navbar a bot would be nice if you'll anyway bring the bottom bar closer to the navbar.
P.S. The fix is extremely easy for your devs:
Insert this line in the <application> tag of the app manifest.