To be fair, you have to tolerate bugs in commercial products as well. The AutoDesk products I use for work crash daily. If you look at the developer documentati

To be fair, you have to tolerate bugs in commercial products as well. The AutoDesk products I use for work crash daily. If you look at the developer documentation, though (https://www.autodesk.com/developer-network/platform-technologies/autocad https://www.autodesk.com/developer-network/platform-technolo...) you kind of get an idea of how mind-blowing complicated this software is. Any particular part might be implemented in C++ or .NET or VBA or a custom Lisp. There's maybe 30ish years of layers AutoCAD is built on. After a few weeks of learning F# and the ACAD API, I concluded that I would much rather just do everything manually than ever write a plugin. Bear in mind, though that everything else (Microstation, DraftSight, etc.) Aren't much better. For a problem domain like roadway design, the difference in productivity between something like freeCAD or LibreCAD and AutoCAD Civil3D is like the difference between having a printing press and a lump of charcoal. I really admire the effort, but there is a moat between industrial and FOSS software for the AEC industry that takes more expert developers and more man-years than hobbyists can provide.