Steerer Tube Spacers

Not sure if this belongs in here but here goes!
I have seen some bikes that have spacers above the stem on the steerer tube, is this just to save having to cut the steerer tube? Or is this there some other reason?
I have seen some bikes that have spacers above the stem on the steerer tube, is this just to save having to cut the steerer tube? Or is this there some other reason?
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