It is for the benefit of R$, and he directly covers why in his opening 2 sentences:
"I think a healthy degree of paranoia and insecurity about releases is probably a good thing. I'm fond of saying that arrogance is the enemy of continued success.
"We don't believe in our success until we deliver it. We never claim victory until it's occurred. We have very powerful, smart, capable competitors bringing great products to market and we need to win - that means we have to work harder than the next guy."
He continues: "I don't think this is a numbers exercise around attach rates - I think this is a question of how phenomenal is the product, and does it capture people's attention and imagination? The answer is clearly it's going to do well, but it's very difficult to say how well. It's going to be a big success, but it's a question of how big?"