I think the most common reason is, that people just want to avoid uncomfortable conversations. Back in the days I was a startup founder, my beliefs were always

I think the most common reason is, that people just want to avoid uncomfortable conversations. Back in the days I was a startup founder, my beliefs were always pretty different from the other stakeholders, and in the end everyone takes their own risks. Having this kind of conversation can be easily interpreted as a recommendation or discouragement, and I wanted to do neither. And while you can also explain the technicalities etc, in the end many people just want the answer "what should I do" from someone.