It was surprising to us (here at Retool) that visual programming has never taken off, despite countless attempts over the past few decades. (That's why we started Retool, after all.) But Visual Basic is probably the product that came closest, and that's why we wrote this homage to it. It, along with Filemaker, Hypercard, are products that we loved. And we always wished that they had flourished, since then we wouldn't…
It has, in some niches like Unreal Blueprints.
I think one of the reasons it doesn't become more popular is because most visual programming is just a more cumbersome and slow way of programming. It's stringing the same concepts together in the same way, but slowly and tediously with a mouse.
Non-tech users wouldn't know what to do with it. Power users would rather program directly.