One-question survey

Hoping this is the right place to ask this... I'm working with a group who wants to conduct survey research to evaluate projects. They're thinking about having an initial, overall question that would be required and making all of the other questions optional. This seems like a bad idea to me because if everyone answered only the initial question, they wouldn't have any usable/actionable data. Also, those who do choose to continue would likely be only those who had very positive or very negative experiences. I can't find any instance where this was used in practice. I'd love to get some input...