Sketch, winner of an Apple Design Award back in 2012, is leaving the Mac App Store:
There are a number of reasons for Sketch leaving the Mac App Store—many of which in isolation wouldn’t cause us huge concern. However as with all gripes, when compounded they make it hard to justify staying: App Review continues to take at least a week, there are technical limitations imposed by the Mac App Store guidelines (sandboxing and so on) that limit some of the features we want to bring to Sketch, and upgrade pricing remains unavailable.
This is just the latest in high profile departures, with companies like Bare Bones and Panic deciding to go their own way on OS X. The state of the Mac App Store is really pretty shameful these days, but it seems that this is the only way Apple might actually pay attention to these issues.