Great article. Another example I'm aware of is Blockhead, which is an experimental DAW that focuses on sampling and audio clip manipulation. The creator (@ColugoMusic on Twitter) regularly posts clips and progress, which I find fun to follow.
Yes! I was vaguely aware of a DAW project in Godot, just couldn't remember the specifics. A DAW seems like a fantastic application because Godot has great support for playing sounds thanks to being a game engine.