“Because WatchKit 1.0 is so limited and performance is so inconsistent, it’s hard to make Watch apps that are truly useful compared to just taking out your iPhone and using the full app. I believe this will always be the case to some degree, even after we get a native SDK.”
Documenting what you have done is critical to understanding it in the future. What is clear today may not be clear in a month and, most certainly, not in a year.
This may apply to other areas but is especially true in software development. However, at least for me this is one of the most boring tasks to do. Specially true if you’re not passionate about the app you’re developing.