It hadn’t occurred to me that AU run out of process, but this makes sense. Does this mean an AU crashing in theory won’t take down your DAW? (The same thing that Bitwig has it’s own isolation feature for)

I always default to AU just because I’m on a Mac and I arbitrarily decided to do so long ago. The Rosetta thing has been a nice bonus. Not sure what the other (dis)advantages are, these days I try to focus on using native Ableton and M4L stuff anyway!