When you control the devices to which you're deploying to, there is little reason why you wouldn't deploy as often as you can. It helps a great deal in isolating bugs to keep your changesets small, and you can either do that by slowing down the product iterations (and getting poor feedback from each), or releasing more often. This is ubiquitous with web development.

Weekly releases (or slower) is appropriate when you rely on users to update their software or firmware. Most mobile app development does this.

> Yes, that probably describes (a very high percentage) of companies. So what?

So good practices are not widely used; therefor the state of the industry on average, is poor.

47.6% of statistics mentioned in comments are completely made up