It is hard to find good examples of why these kind of questions are not helpfull because, when a proposal fails before reaching Beta, all of the related questions are deleted along with the proposal.
There is a lot more to a successfull proposal then getting through the phases and reaching beta launch.
The Commitment phase requires 200 followers, half of whom have "200+ rep on any other site" from a purely logistical perspective in only take 80 people to get the 40 questions with 10 votes needed for Definition phase. Your 100 experienced SE users should not have difficulty figuring out what needs to happen, so there no added value in asking or telling people how to vote.
You have one year to complete the Definition phase, if you move through it with the minimum of 80 people, then you only have 12 months to attract the other 120 people you will need to complete the Commitment, this puts the proposal at a disadvantage. see 1 year in Definition + 1 year in Commitment
So what happens when you do manage to use a meta post to move a proposal forward. Here is an example that worked well Have you used all 5 of your votes? it may have helped the site get to Beta Launch which we can see was closed after 17 days in Beta.
If the proposal has what it takes to become a successful site, there is no need to "help" people figure out how to move it forward.
If there is a need to help the current group of supporters figure out how to move the proposal forward, the proposal does not yet have the group of people needed for a successful Beta launch. If they follow your "guidance" all you have done is help speed the demise of the proposal.
So what can you do? Other then encouraging people from outside of Area 51 to join the proposal, you need to encourage people new to SE to get familiar with Stack Exchange. The requirement for 100 people with "200+ rep on any other site" is there for a reason, it is one of the most important criteria in a site/proposals success.