I accidentally killed a very promising project this way. I gave a pitch demonstrating how it could stand up brilliantly to multiple avenues of ruthless investigation and criticism. People didn't listen to the words, they listened to the emotion of the ruthless investigation, and they discarded the idea in favor of one which would have tipped over if someone had brought a similar magnifying glass to within a mile.
Once I realized that good pitches were about emotions, I started getting much better results.
It's a very painful moment in everyone's career when they realize that, no, they're not the only one that has noticed that powerpoints are usually full of fluff, and no, they're not going to get anywhere by changing that, because yes, they got that way for a reason.
I don't think it's just presentations or even corporate culture in general. I sell second-hand goods online, and have found that explicitly describing any defect completely torpedoes the sales process.
Having a photograph that shows it off clearly but saying nothing doesn't have that effect, though.
The more I learn about optimising the business for revenue, the more I come to understand that consumer-focused retail is essentially a socially acceptable form of prostitution.
We don't exist to solve a problem in peoples' lives, but to satisfy primal urges, indulge fantasies and make people feel powerful/special. The actual product you take home is just a souvenir.
Going back to GP's comment, I wouldn't be surprised if many corporate jobs could be looked at this way too.
Perhaps that is cultural? We're used to faults only being addressed when they're really dire; hence, if you address any faults, your product must be in a dire state.
In reality, that is probably the case, but it's also the case that any culture always moves in this direction; the nash equilibrium is reached only if you describe your product a bit too rosy.
Once I realized that good pitches were about emotions, I started getting much better results.