[meerita]

The problem resides in the exposition: if you give your opinion, you're just telling the rest you're not sure, and that it's your viewpoint. If you instead give facts, you're telling the rest of the audience the data that drove you to that design.

I'm really tired hearing people at meeting talking and giving opinions. They're just that, they're never facts. Only facts shows the truth and facts don't need argumentation in most cases.