Good for them because profile pages in Twitter are more or less useless. I honestly don’t know anyone who uses the actually Twitter website for Twittering and these changes wouldn’t impact that because TweetDeck or Hootsuite on the desktop and third-party apps on mobile offer a better user experience.
Still, I like these changes because at the same time it’s often difficult to size up what an account is all about from third-party Twitter clients. Having richer profile pages on Twitter would be a step in the right direction. I could imagine using Twitter for a combination of robust profile pages and managing Twitter ads.