And now this integrates that with actual hardware modulars

Nop.

No Motu devices have only DC-coupled outputs

MOTU

Exactly.
DC-coupled outputs are relatively common.
https://www.sweetwater.com/sweetcare/articles/which-audio-interfaces-are-dc-coupled/

https://www.expert-sleepers.co.uk/siwacompatibility.html

The kind of hardware integration those things allow is interesting, of course. You can drive full Eurorack systems from a laptop or even a tablet.

What’s missing is the other way around: using CV to drive something on a computer. A few DAWs (notably, both BWS and Live) have software devices which allow you to use CV signals in neat ways. Part of the reason this matters has to do with the limitations of MIDI (1.0). In some cases, that might be latency. Yet resolution is way more important, to me.

To be clear, there are many modules which do CV input and can send that through USB. Technically, you can describe those as “audio interfaces” and might be able to win a court case about that. Yet it’s a very different interpretation of the concept of an “audio interface” from the one typically used in the market.
“Why would you need an audio interface to handle CV input when you can have modules in your Eurorack system which send CV signal to a computer through USB?” Well, there can be multiple reasons. In my case, it’s because I have CV out on a windcontroller and I want to be able to use that directly on a computer without a Eurorack case (fewer devices and cables).
Besides, these modules are as expensive as this full audio interface from Bitwig, which is bus-powered.

Also, there are plenty of ways to convert CV to MIDI. That can be quite convenient, as a way to integrate Eurorack and plugin systems. Yet it basically defeats the purpose of DAWs’ CV tools.

I used to run 4 of them as a single aggregate audio interface on Mac OS.

If you have older computer with firewire or thunderbolt (using a firewire to thunderbolt adapter) you can pick up older MOTUs such as 828MKll for dirt cheap.

Indeed! Even those which are close to three times as expensive (like the AudioFuse 16Rig) only do DC-coupled outputs, not inputs.

The only other DC-coupled inputs I find are from the ES-8 and ES-9 modules, which are both more expensive than this audio interface.

Wish we had dedicated CV to USB-C options.

My particular use case is breath control. With the 7-bit resolution of MIDI 1.0 CC, stepping/zipping occurs. Of course, slewing is always an option. Unsatisfying, though. Having tried breath to CV on (semi-)modular gear, I dream of having that in the DAW. Did rig something up through AM, at some point. While it was a finicky setup, the smoothness of the breath control in Bitwig Studio was really satisfying.

So, I might end up saving money for this one. Just to get CV in.

Even on the Arturia it looks like only the outputs are DC coupled. That is probably enough for most use cases, but DC coupled inputs allow one to bring modulation signals from Eurorack back to software, which allows for more complete intergration.

Seems like only outputs.

Check out Arturia AudioFuse 16Rig

I hope they bring mouse hover and knob turn to any midi controller. Would love that.