I can't easily "refactor" parts of my factory without fearing it will break some pipeline that depends on the changes. I wish there was a way to "write" "tests" or do mass changes safely. Blueprints and robots help automate things, but it's not that flexible.

I wish I could use a "debugger" and step through the execution and play with changes to see how it affects the factory.

And then I finally get to the conclusion that this would all be easier from a text editor using proper programming tools, and more enjoyable to work on a real project that could have tangible benefits (and then never finish that either...).