I did indeed suggest that the King's Castle Siege be designed on plates instead of a raised baseplate. With the exception of 6097 Night Lord's Castle in 1997, the theme had not seen a main good guy castle set on flat plates or baseplates since 1988's 6085 Black Monarch's Castle. Building on plates allows the addition of modular sections such as walls and towers. You can connect multiple copies of the KCS or add in sets such as 7029 Skeleton Ship Attack. Unfortunately hinged walls were not included in the main castle set or any subsequent smaller wall sets. This does limit the geometry of custom castles.
Raised baseplate castles do have certain advantages such as increased set size, playability, and easy of transport. However, I felt that the last few raised castle designs were uninspiring due to design repetitiveness. Compare the following three castles and you will see that by reusing the same base, the castles are extremely similar:
http://www.classic-castle.com/sets/archives/6091.html
http://www.classic-castle.com/sets/archives/8781.html
http://www.classic-castle.com/sets/archives/10176.html
One may argue that 8877 Vladek's Dark Fortress was built on plates. This fortress is usually shown as a long wall and with the use of burps replicates the "one a hill" design of a raised baseplate castle. The Viking Fortress also features a nice octagonal design on plates. Both of these sets do not have the level of modularity of KCS. In my opinion, the plate design and modularity were a nice change for Castle. I would not be opposed to a well designed raised baseplate castle in the future. Hopefully a better raised baseplate with a ramp would be used.
Ben



