This pretty much aligns with my experience with SpecKit - I'm excited by it, and enjoying working with it, but have had a hard time finding guidance on advanced real world use cases.

All the tutorials I've found are little more than "here's how to install it - now let's make a todo list app from scratch!!"

Would be great to see how others are handling real world use cases like making incremental improvements or refactorings to a huge legacy code base that didn't start out as a spec driven development hello world project.