The reason will be the type of fining they have in the kit. The lees are probably necessary to form the blanket that grabs the negative and positive particles on the way down. There is a process call surdelees I hope the spelling is at least close. This process involves gently stirring the lees over a period of time this has the effect of changing the mouth feel of a wine.
![Yummy](https://www.winesathome.co.uk/forum/core/images/smilies/bob/yummy.gif)
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