> I stand by my opinion that any kind of documentation or tutorial should pass a validation step where the author does copy/paste of all their commands into a clean Docker container or VM image. If any error happens, your work is not done yet.

Very much this. We often write scientific software with (command-line) instructions for nontechnical or sort-of-technical users and have learned from experience to not assume anything about the user's environment, or background knowledge, and to try to replicate our documentation's instructions line-by-line!