This article mostly seems to ignore the fact that you can still distribute apps outside of the App Store. In fact, considering the falling costs of hosting and easy access to marketing tools (look at the quality of the website for any Mac App), it's probably never been easier. For pro apps with dedicated audiences (see: Adobe, Ableton, Avid, Nuance) which is just about anything with a plugin architecture, the App Sto…
It is true that inn terms of dedicated (aka existing) audiences or customers, access to is probably still unnecessary, however it is clearly a disadvantage when it comes to generating new users or providing upgrades to existing users.