https://support.google.com/docs/answer/3093339?hl=en

There are other ways to structure and edit programs than just a bunch of source files that we manually edit through a text editor. For instance image files as in Smalltalk. I don’t see any reason why a visual representation couldn’t succeed in this regard. The issue, imo, is that text is really nice to work with, and it would require a very nice visual editing experience to beat the text based tools we have today.