[Tyhm]

Probably a good thing we don't dictate policy, then. ;-)

Say they move movement from serverside to clientside.
Any script that edited movement - from defining the size of blocking objects to pushing the player away from or towards certain NPCs - has to be rebuilt to make sure it's moving the Client instead of/as well as the serverside.
Then if you get hit, your flying-backwards is clientside too. So everything that used to hit you serverside has to hit you clientside. Every NPC that does damage has to make sure the Client's in on the game.
And on it goes.
At least they don't have to edit 3000 levels in the level editor like we used to have to; For The Most Part they can just open the Classes pane and edit "baddies" and "sardon_vortex" right there in RC. For the most part.