The nice thing about visual programs, is they have less requirements on long term memory, working memory, and use more recognition of items instead recall from memory - which is harder.
They are also more concrete and less abstract, which again, is easier, memory wise.
And maybe because of all of those, they also require less focused attention.
On the other hand, it's possible that it's incidental, that textual languages designers don't care deeply about that niche, or that textual languages(and their libraries) seem to evolve towards power/complexity, or that such requires deep work on an IDE, which is a big barrier-to-entry.
They are also more concrete and less abstract, which again, is easier, memory wise.
And maybe because of all of those, they also require less focused attention.
On the other hand, it's possible that it's incidental, that textual languages designers don't care deeply about that niche, or that textual languages(and their libraries) seem to evolve towards power/complexity, or that such requires deep work on an IDE, which is a big barrier-to-entry.