One of the most challenging problems when talking to a new person about your idea and your plans is bringing the person to the same page as you. When you are doing a start-up, you are coming from a perspective. There can be dozens of little calculations in your head through which you came to the perspective you did. Thing is, you've had weeks and months to work out those calculations. The end result of those calculations are the decisions you've made.
Why does it matter how you reached your decision? Why does it matter that you communicate how you reached your decision?
Go back to your high school math class. Remember the time you kept getting a different solution to a problem than what the teacher had on the board? So you go up to the teacher. And what does the teacher ask for? The work! Where is your work? Because your work can help pinpoint exactly where you went wrong.
The same applies to decisions at startups. You cannot be clueless about your decisions...even the good ones! You need some basis for why you made the decision you made. I believe most people have it. But it is not as easy to communicate it to others. Why?
Unlike high school math, it is greatly inefficient and unpractical to actually work out your decisions for your startups on paper. This brings us to a point where we can communicate decisions("I'm gonna start widgets to elementary school children") but the why is harder to communicate. This is because imagine having five bullet points answering why you want to sell to elementary school children. Each bullet can have five more points! For example, one of the points can be the fact that a certain respected journal thinks elementary school kids love widgets. But within that point, you've also taken into account the fact that that journal is better than its competitor; that its projections are usually right because you read a report a month ago; that the author of the report has lots of cred. Those are subpoints that you work out in your mind. But they are difficult and cumbersome to communicate. And yet, if you don't communicate, you will get feedback that assumes you made a knee-jerk decision not taking into account the pros and cons. You, of course, did take into account the pros and cons. In your head. Over weeks and months.
May be I'm just talking about judgement.
ps: one thing I do more and more is ask the question "where are you coming from?" a lot before offering feedback.