And then if you're unlucky you might hit one of the areas where the AWS documentation has a "teaser" about some functionality that is critical for your project,

And then if you're unlucky you might hit one of the areas where the AWS documentation has a "teaser" about some functionality that is critical for your project, you spend months looking for the rest of the documentation when initial foray doesn't work, and the highly paid AWS-internal consultants disappear into thin air when asked about the features. So nearly a year later you end up writing the whole feature from scratch yourself.