It would be really good to be able to remove the apps you do not use so you can simplify the desktop. You used to be able to do this in the older versions but I cannot seem to find this option now.
This is still possible under “Settings -> Parental Control”. 
if you want to remove the WSJ, MLB or Flickr you’ll have to SSH (or SFTP) into your device and edit some strings in a ‘plist-file’. Instructions here; Remove ANY icon from main menu (MLB, WSJ, Flickr) - 2nd gen Apple TV - Firecore