You've only known this person for 45 minutes. You've known yourself for decades. Which one are you going to assume is the idiot in this situation? How often are you going to be wrong? And how would you ever know if you were wrong? You just kicked this person out of your life because you didn't like their answer. If they become lead developer at your biggest competitor, are you even going to remember their name?
Someone with far more practical experience than you might sound paranoid about some things you don't even think about, and blasé about others (because they have ways to mitigate the problem if it actually happens). You won't know enough to realize why they aren't on board with your priorities, and you will make conclusions that have no basis in reality.
You've only known this person for 45 minutes. You've known yourself for decades. Which one are you going to assume is the idiot in this situation? How often are you going to be wrong? And how would you ever know if you were wrong? You just kicked this person out of your life because you didn't like their answer. If they become lead developer at your biggest competitor, are you even going to remember their name?