And what about when a notebook is encrypted?

Yeah, same here. I was very surprised by the assertion in the article that hibernate is largely unsupported and unreliable, since it just works for me and has for years on various different laptops. But this is with Debian.

That said, it's good to know that the kernel upstream is focusing primarily on suspend, since I was only using hibernate on a mild general principle of not using up power that I didn't need to use up. Maybe I'll experiment with using suspend instead for a while.