The company doesn’t care if you’re happy, they care that you’re going to spend money. Most people don’t have the self control to not pay attention to the hype and the delay makes people talk about the product. The delayed gratification only makes you want it more as now you have to wait and think about how you don’t have the thing that you want.
Tech and video games do the same thing. It’s so the influencers have time to make proper informed content prior to the release date and so channel partners who develop things like online support tools have time to match the launch date with updates to their tools.
If the influencers/reviewers get a long period both before the embargo lifts and before the actual launch it means they’re pretty confident in their product and believe it will be reviewed favorably. The smaller those windows are the more likely they’re trying to get you to preorder something half baked that will get ripped apart on review.
Jade empire is solid gold and it’s a shame it’s not better known.