code in RSG xml not needed

ContentID could be used for any number of things - from tracking what got played by reference to a server, storing a bookmark based on the contentID on the roku or server, looking up a master list table by content ID for extra information, etc etc.  You would need to look at the channel code to see if it's used.  Also, the same feed can be used by more platforms than simply roku - if you remove them from the feed file you might be breaking support for other apps like android or amazon fire or something.  Ask yourself - is removing those lines of the xml truly necessary and then check with your team members before making drastic changes to what it downloads.