I suppose a poor cabling job might require that little springs assist to the clutch lever...
I size every cable except a 2 stoke throttle cable (both ends have fittings) to a size that looks and functions nice, I have ~65 2-stroke builds so far, and I have never used that little spring for it's purpose, but they do work OK for a 4-stroke throttle return spring so some get reused ;-}
There is art to pull cable cutting but it's easy to learn, the thing is you need the right tool and they are like ~$45 so not worth it if you only plan to build a bike or two, for me it's an essential tool and why my builds look so 'clean'.