With the announcement blog post for Hookpad 2, I thought it was actually feature complete until I read the post.
Just to be clear: Hookpad 2 is far superior than Hookpad 1, with changeable tempos, key signatures, time signatures, and more functionality in general.
However, Youtube video attachment, and thus Theorytab integration, is completely absent in Hookpad 2 as of this post. Thus, even though HP2 include many quality of life improvements and bug fixes over HP1, you are still shoveled into HP1 in order to contribute to the Theorytab database.
Devs, people are paying you $5 per month subscription for an incomplete piece of software that has been incomplete for months. I was expecting at least some sort of hack to get Youtube attachment, at least.