The reason why I'm a bit concerned about Unreal Engine 4 is that way how they completely change everything every new engine release. People that learned Unreal Scripting for years are now pushed to learn Blueprint or C++. Also the editor changed completely, and this is something that Unity doesn't do that much. It's like learning Photoshop or 3ds Max and next release you look at Painter or Maya instead, because they changed everything. :S

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