As a software engineer, you've taken the effort to generate requirements document, various module development plans, a high level design document, multiple interface control documents, and finally begin to codify the design. Now, graphically embed the essence of all those documents into intermediate object files, link them together and swear on a rack of Sun Solaris Manuals that you can support the product for the next ten years.
The answer: you can't. Tools evolve and die off, while text-based intermediate files are infinitely easier to support in the long run. Imagine what happens when your current version of LabView falls out of support and you have new requirements or a critical problem to resolve and your only machine with LabView has died a horrible death taking your hard drives with it.
Or better yet, developed test programs using VB 6.0, and woke up in a new millennium where your application no longer works on a Windows 2016 machine. What to do, Bunkie?
Do you REALLY want to have a George Jetson job making sprockets with your one red button? Steve Jobs said YES and created the iPod.