I disagree here. Focus should stay at the editors as it stays at the engine too. Even more at them. Because that's where the engine gets its life from. Adding content is a thing of the editors. And what's a game without content?

At least I need feedback. Immediately. And not after dozens of not necassary mouse clicks and including tons of external code to have a look at the result. Unexpected slow and complicated workflow just leads to frustration. And you will see this at the games.