I think its only because Unreal has one, and everybody wants to be like Unreal.

I think Lua in Roblox, or the Godot's python like language, or Unity's C# is strictly better in every way.

Visual Programming languages don't prevent "non programmers" from writing really weird code that makes no sense.

You will find many first time programmers that like visaul programming because they created something cool in Unreal. I think if there was a Lua integration they would have achieved more, faster.

We use words to communicate our thoughts in comments on Hacker News. What would our communication be like if we only had flow charts you could plug variables into?