As a fan, I tend to prefer having a finished game show up over following it through the development stages, since far too many games end up being abandoned for reasons that I can perfectly understand but still results in disappointing ends. Besides, I've usually found that most suggestions or ideas I can offer are fairly common ones that the creators were already either planning to include anyway or are so 'niche' that they get drowned out by people asking for more popular kinks/scenes that show up in a majority of games. So, I'd usually prefer to just have a finished game presented to me and potentially be surprised at what the person/people behind it decided to throw our way for sexy fun times.
That being said, I do completely understand why a lot of creators prefer or even need the more 'in progress' approach with community feedback and assistance.