The reasoning is stupid.
The server kicks (at least it's supposed to kick) when a player's average FPS drops/is below 20 FPS.
The players have freedom of choice and can choose whether they want to play with a frame limiter off or on. We are not planning on making the frame limiter be forced to ON or OFF.
The command does not appear as useful to me in any way, but, meh - why not, it's easy to implement and won't hurt anyone.
So, +1.