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Code sharing is actually really good in visual languages if done right because you are forced to have well defined inputs and outputs for your nested structure. Search is getting better and is not bad in Simulink. Pattern matching would be an interesting research project. Those big wire rats nests typically come about because the people using visual languages (especially Simulink and LabVIEW) are only doing that as their secondary or tertiary job. It's more important to get something working out the door than to do it well and proper and maintainable. Besides, it's hardly limited to visual languages; I'm sure nearly everyone here has gone back to some code they wrote in the past and found it nearly indecipherable.

The main benefits of visual languages is that they allow domain specific people to work in methods that are natural to the problem and closer to what they are used to. Some problems can be represented very easily visually but are a big pain in code such as physical systems. Data flow and timing diagrams lend themselves very well to visual descriptions and can help prevent race conditions. WYSIWYG editors open up software domains to huge swaths of people who go on to produce some incredible work. Yeah, ultimately, people run up against the limitations of these programming environments and then you either transition to a less friendly but more scalable code, turn into spaghetti mess, or give up.

I think the biggest thing text based code development has for it is that text is inherently "open" and simple to share so tools get built for it while most visual languages tend to be proprietary, niche, and locked down. Maybe one day we will see a solid FOSS visual programming language/environment that hits above it's weight and can drop into other languages specifically for handling types of problems. I think that would be ideal but articles like this one that are close to straw man arguments don't help get anyone excited to work on it.

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