What is unclear is why the choice is binary?

The choice is binary at this time because the developers have said they are considering the change to 4 weeks it is a simple paramater change. None of the other ideas discussed are in that category.

They can be discussed further and potentially polled later.

Also the result of the outcome could be questionable as one proposal is older than other and ...

You are right, it isn't 100% reliable. It is also non-binding. People (developers, witnesses, and stakeholders) will have to use some judgment in interpreting the results.

(Reply was posted by @smooth; I used the wrong window. All rewards on this comment will be burned by the @burnpost bot)