Since this is your first post in the forum, I assume that you are not an Unreal 4 developer. Unreal 4 has this sytem from the very beginning (Name is Blueprint Visual Scripting) which is a core feature of the unreal itself and the engine itself is free, so is this tool. Unity one is made by a person and is 200 USDs. That’s what we are comparing.
To be honest, such a massive tool is still subject to fail. What if the guy stops making updates and bugfixing? What will happen to your 200 USD then?
If someone really needs such a visual scripting to create games, they can as well as use Unreal. 