There is nothing wrong with accepting new ideas. Even Apostle Paul changed his mind when he "saw the light". Indeed, I hope to learn new things every day. There is nothing wrong with real "new light".
But I have problems with the way that the Watchtower operates its "new light" system. Not that a light stays on for long. It switches on and off, like the twinkling lights on a Christmas tree or it cycles like traffic light signals. What was old is new again, until it becomes old, waiting for its turn to be switched on again for a while.
All of that could be a cause for ridicule, but there is a seriously sinister side, at the human level. Each time a new light is switched on, the organization demands lock-step acceptance. All minds have to switch over, whether a person agrees or not, only to be told later that the process has once again been amended - sometimes reverting to previous ideas.
What havoc does this play with people's minds? Having to mouth ideas that in their minds they cannot accept yet must on pain of eternal damnation (or loss of family) be forced to give allegiance to? What mental damage does this result in?