No judder spring in clutch, came brand new like this. .

So i took my clutch apart to check out a few things and i was following the service manual as i went. I pulled the last plate out and went to pull out the two washer looking springs but they weren't in the clutch. In the manual and on the parts list both springs are listed there. . i took the bike to yamaha and they had a look and said yeh they arent in there. . .it just seems like it was never put in. The service manager said its fine and they dont really matter and that i can leave it as is. . 

My question is, what do those judder springs do and can i actually just leave my clutch without them in there or should i buy them and put them in? Ive googled and googled some more but its back and forth on good or bad for either way.