Macworld’s Lex Friedman:

Depending upon whom you ask, Friday, June 1 is the best or worst thing to come to the Mac App Store since it opened its doors in 2011. As of now, new and significantly updated apps submitted to Apple’s Mac App Store must implement sandboxing.Sandboxing refers to compartmentalizing what data and features a specific app is granted access to; apps each can metaphorically play exclusively in their own sandbox, accessing only that data which Apple has granted that app entitlements to see. The plus side of sandboxing is that it means, in theory, that your apps will become safer and more trustworthy: Your Mac prevents them from accessing files they shouldn’t access.But that security comes with a price, at least in some cases.