When you like a song in a playlist, such as your daily mix, it shouldn't immediately add it to your library as this is easy to do anyways and instead should just tell the algorithm that you like the song and suggest new ones for you
Updated on 2019-08-07
Your idea was submitted a while ago and unfortunately didn't receive the amount of kudos needed to stay active in the ideas board (100 Kudos per year).
In order to keep the Ideas Exchange clearer I'll close this idea for now, but this doesn't mean Spotify rejected this idea.
If you think this is an idea which needs to be implemented, you're welcome to post it in a slightly different form :)
Have a nice day!