I disagree. The time to judge the product is before they sell it to me. In most cases, there is no refund if I buy the game to judge it and don't like it. I will judge it before I spend my hard-earned money. That means with what I see. Or a Free demo if any.
Agreed. If no criticisms or feedback is put forth now before the game enters into later development stages, then nothing will change.
That being said, there's a line to draw too on what's reasonable and unreasonable. Party sizes before balancing is finished? Why not. Changing whole core systems and expecting huge balancing changes between two modes, etc.? Not so much.
