After the removal of the Spotify widget without any notification via the app I believe that any big change which Spotify are thinking of doing that will be noticeable by users of the app should be presented to them when opening Spotify app. I was think maybe a voting button/window. Perhaps there should be an option for users to opt in/out of voting for these changes?
Updated on 2019-08-16
It sounds like you are talking about the Ideas Exchange. It's here where you can leave feedback and propose for features you'd like to see implemented.
If you'd like the Android Widget back, leave a vote here.