I have noticed that my eyes strain to see Spotify during the day and in dark area's because of the dark theme. My proposal is that Spotify can make a light theme for those android users who cannot invert colors easily. It would definitely boost people's usage of Spotify if we could have a light theme. (Yes, I know there is an idea posted 5 years ago, please just give this a chance.)
Updated on 2019-01-10
As you mentioned, a similar Idea has also been suggested, and only one thread can exist per idea:
If possible, vote for it, and add a comment there, so it may be considered. Any update on the matter should be posted there.
For more info on how the Ideas Board works, click here. :)