There is a lot of effort put into determining what is on topic for a site heading towards commitment. Sites can't enter the commitment phase without having a certain number of good quality questions.
The Chinese Language & Usage site which is almost ready to go into beta and is picking up steam has a set of questions that I think aren't the best example of what should be on topic for the site:
Why are “Peking” and “Beijing” two different names for the same place?
This is a wikipedia type question and can be found with very little research
How can you type Chinese characters on a computer?
I think this is borderline off-topic. This more of a personal preference type question or I'm having trouble installing the software after doing a Google search and downloading.
What are the common parts and history of the Chinese and Japanese written languages? What are the differences?
There could be a book written on this. It's not an answerable question.
How do you convey sarcasm in Chinese?
I would argue this can't be reasonably answered. It's like asking how can I say something impressive in Chinese. It all depends on the context and your skill level to be able to pull it off, not saying the right thing.
So what to do now? Do low quality proposal questions really matter? If they don't matter do they serve a real purpose for defining a site or do they just hold a proposal up until there is enough interest?