Are you kidding? Even its fans bashed Samsung for leaving out the very features that people loved, like expandable storage and water resistance. Plus not having a way to replace its tiny battery.
That's why Samsung brought those features back, along with a larger battery and fast ways of charging it. And sales are apparently back up because they listened to their customers instead of dictating.
Correlation does not imply causation. You should know better. There's no proof whatsoever that their sales are up because of those features. Or that they declined when they were removed.