This is levied as an incorrect basis because you really can just tell sometimes, the descriptions we give are all ways to rationalise and cultivate our suspicions and that isn’t guesswork at all. It’s like knowing when someone’s lying to you; sometimes there are false positives, sure, but it’s not like you’d have to scan the jar for fingerprints if you know someone close likes chocolate too much.
You’ve been spoiled by the Minority Report state of standard BotCU games.