To me it looks like the grab rails are a large part of the rear of the bike. Be interested to see if they are removable though, if for no other reason than to repair them if I manage to break them against some rocks.
I have a similar feeling that the 'rails are part of the arse end of the bike. However if possible I want rid of them as they are causing me when standing on the ground to lift my leg into an unnaturally high attitude to get on to the bike. Presently to overcome this I stand on the left peg to swing over. So I would really to get rid of them.