It's a difficult line to walk. On the one hand we want free, open and honest discussion. But on the other hand, it would be wrong to produce an echo chamber or any form of gatekeeping. There are also potential pitfalls surrounding collusion and corruption.
What bitcoin proposals do you regard as controversial or even harmful ? And why?
I believe that the most dangerous proposals are the ones which offer a trade-off with decentralization.
AFAIK, decentralization must be protected at all costs, and this is the one thing that makes bitcoin valuable and useful.