Excel as Code
I've been tasked with migrating an excel model to a "real language" (usually by breaking it apart and re-implementing it via a combination of ETL and data warehouse jobs). I've never found a great way to run excel in a headless way, so in addition to not having version control for it, it's hard to "deploy" it when it grows beyond a single person's machine. I wish there was more of a gradient between Excel and "real systems".