For example, IMHO one of Slack's best features from the beginning was on the iOS app when you clicked the button to upload a photo you were presented with "Last Photo Taken", "Camera Roll", or "Take a photo". That "Last Photo Taken" button was genius. Simple and I found 90% of the time was what I wanted to do, and it just worked. In one of the last revisions of the iOS app, they removed that feature and replaced it with a newer redesigned photo picker. The new photo picker is riddled with bugs and a good percentage of the time fails to upload the photo at all for most of our paid team members. Some have resorted to using the desktop app to send a photo after transferring it over from their phone. When Slack was a small scrappy startup I'd open tickets and spend the time w/them to get them the information they needed to debug various issues, but now that they are at this scale and size I can't be bothered.