Not really necessary for most mountain riding on the new sleds but there always seems to be a use for it once in a while. Leave it on, good for leverage in some stuck situations, good sometimes for really low speed sidehilling, great for handlebar bag. Don't use it much but handy when u need it. Got thru the old metal D handle bar days, and Cats first attempts so i think we can handle the new semi rigid bars (that new cat one looks strange tho). Each to his own, I keep seeing (and hearing) all these pro type MOUNTAIN riders who , never carry gas thats stupid,.....take off the windshield first thing, not needed.......have no need for any seat storage or otherwise,........no backpack,too restrictive.........have no nedd for a track longer than 146, too tough to turn........need a bar riser about 40 inches high, ........and can ride all day and only use 1/2 a tank of fuel. I suggest these are not the traits that define a mountain sled or rider.
But...I know, Different strokes for different folks. We all enjoy ourselves some maybe a bit more prepared for the situations we have seen develop, some maybe not quite as aware or experienced as to what can happen when you get a good distance from the truck.
Me, I want the things that are gonna make my mountain experience more enjoyable and safe, even if they add a few pounds.