I completely agree with the OP. There is absolutely no reason for this change other than closing the gap between new players and practiced ones. Citing server lag is a smoke screen. One could just as easily say that this is punishing players who can execute throw clipping. This will completely gut carnage and ruin the flow of the rotation that people who know it have come to love.
I used the term "practiced players" for a reason, because I don't think myself or others who can do it are just gods far and above those who can't. It isn't hard to learn. If you park yourself in front of a dummy for any length of time I believe anyone can learn how to land 4 GCDs inside a berserked/zen ferocity/precision window in no time.
I'd argue that the primary component to carnage/combat is rage/focus management. Ensuring that you always have enough for each ferocity window and getting 30 fury/centering stacks when you need them.
Instead of disrupting the orchestra, the masterpiece, that is this spec,just increase the duration of ferocity as others have mentioned. It will be really sad if these changes go through in any manner close to their current form. People who main carnage know that it's a brilliant piece of class design.