I think because it's so simple you shouldn't have to go learning Objective C and Cocoa or C# if you're writing Windows apps. If there was more to it, sure, I could see whipping up something in ObjC or C#. But both of those languages require a bit more overhead and ObjC is notoriously a pain to work with. So I think choosing Electron for such a simple app makes sense.
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I think because it's so simple you shouldn't have to go learning Objective C and Cocoa or C# if you're writing Windows apps. If there was more to it, sure, I could see whipping up something in ObjC or C#. But both of those languages require a bit more overhead and ObjC is notoriously a pain to work with. So I think choosing Electron for such a simple app makes sense.