Spotify recently released an update that changed the appearance of the in-app player. I'm estimating that this update rolled out around the 8.4.90 or 8.4.91 versions for iOS.
The biggest thing I dislike is that Spotify's new player makes it much harder to see the elapsed time of whatever you're listening to.
$1The old white bar has been replaced by a much fainter grey bar, which has caused significantly more eyestrain for me.
I wanted to post this to see if anyone else might have this issue. I'll be sending feedback to Spotify about the issues I've been having as of late.
**Edit**: The collapsed smaller player doesn't have this issue. You can see it
$1.