[cycloptic]

I am a JACK/Ardour user and I still use application-application routing regularly to do other things. There are some workflows that are hard to do inside any given DAW, not just Ardour. This results in me having to run multiple DAWs at once, so running Ardour directly on ALSA won't work. You're right though that this situation is overkill -- I want to help fix some of these issues but Ardour is a large project and is difficult for me to start contributing to at the moment. Porting JACK-native programs over into audio plugins also takes time. Unfortunately this means I will probably be stuck on JACK for a while.

But all that is beside the point anyway. I still stand by my statement that a new DAW should use the JACK API, for compatibility purposes. I would change my mind about this if it ever comes to the point where JACK support is removed from Ardour and the other major DAWs. Take that as you will.