Does anyone know the rationale behind the John Deere L-Series riding
mower 2006 redesign?

The twin-cylinder 20HP engines were replaced by 1-cylinder 19HP AVS
(anti-vibration system) "John Deere" engines. ALL of the mower model
numbers were changed.

Was the 2005 model too well-made for the price (thus reducing profits),
or was it too poorly made (thus reducing reputation)? Does anyone
know?