One of the reason that finally got me to drop Spotify is their constant (and usually very small) tinkering with their interface. I used to use it in specific ways and not very often so when I needed to find or edit a playlist it was very annoying to discover that a button moved or even its text changed. Same for Slack, which I’m very thankful I don’t have to use anymore.

Slack and Spotify design teams really need to appreciate the purse: if it ain’t broke don’t fix it.