b, err := os.ReadFile(path)
    if err != nil {
      return nil, fmt.Errorf("read %s: %w", path, err)
    }

is so much better than

    b := Must!(os.ReadFile(path))

because when things go wrong, I have exactly the right amount of information I want. Assigning to err magically (it's not even mentioned in the source code) is exactly the kind of thing that'll turn out to be the cause of a subtle bug 6 months later. Why not spend the a couple of extra lines thinking about the error when the context is still in your head?

Additionally I like how error handling acts as a visual delimiter, especially when you use meaningful fmt.Errorfs as strings are usually highlighted with a different colour, making it easy to quickly jump through code.