It's an extremely poor redesign, there's dozens of examples that could be picked apart, like the way that when you're reading an email in your Inbox, the "spam" and "delete" icons are icons, but when you read an email in your Spam folder, they're replaced with text descriptions of "Not Spam" and "Delete Forever".

The change between the 2 concepts should surely have told someone that the icons simply didn't work on their own - nobody knows what the "spam" icon means without a text popup when you hover over it.