You could be cynical and state that, by tapering the spring, it means that Schumacher then do not have to make specific ball cups and spring retainers for that one car, but can use generic parts.....
or
By coning in the bottom of the spring, it allows for a slightly longer spring, which shouldn't get coil bound, but by tapering the bottom, allow for extreme angles of the shocks too.
Definately an interesting concept (one of the better ones, from Schumacher) and if it allows the car to drive better, then who cares!
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