So DepthAI's purpose is to allow real-time perception and interaction with the physical world. So it provides per-frame results of what objects are and where they are in physical space - exactly what all robots need.

So unlike almost all stereo cameras, DepthAI is not intended for only algorithmically generating 3D maps - doing algorithmic simultaneous location and mapping (SLAM) - or generating 3D models of objects. Such is a more traditional use of stereo cameras, and is largely all that these could be used for before the advent of being able to run neural inference directly in the camera. So here is a quick summary of cameras if you are looking to do only stereo vision and/or SLAM and/or 3D recreation of objects:

Occipital, here
Stereolabs, here
Xvisio, here
Intel T265, here, Intel D435, Intel SR305 here, Intel D455
Kudan, here
MyntAI, here
Azure Kinect DK, here
Duo3D, here
QooCam (more consumer-facing), here
ArduCam stereo pair for Jetson Nano, here
PiEyeCam ToF, here
WithRobot, here
ncam, here
Zivid, here/here/here
Onion Tao here
Orbbec here
In terms of 3D scanning, this KickStarter Revopoint POP seems to make AMAZING maps of objects, here
Good comparison review here
ToF camera here

So these stereo cameras could be combined with a host computer and an AI processor to accomplish the same thing that DepthAI does all in one camera.

The below figure summarizes it:

So for applications that need depth sensing only (and don't need AI and don't need high-res RGB), the above solutions are probably of more interest.

Where DepthAI is applicable is where Spatial AI is needed in a small, integrated unit. So to enable things to real-time interact with the world like a human would - in a small, modular, open-source eco-system.

And... there is application to use the onboard AI processing in DepthAI to make AWESOME depth (using AI to fill in disparity gaps, improve dense depth) and AWESOME SLAM results (using AI to better track features, etc.)... and this is currently under development, enabled by ArduCam.

See below for a bunch of pertinent threads and Github issues:

Original request for this here
M12-Mount IMX378 request here
M12-Mount OV9281 request here
Fish-Eye OV9281 (for better SLAM) request here
Global-Shutter Color Camera (OV9782) with same intrinsics as OV9282 grayscale here

Thoughts?

UPDATE 3 August 2021:
It looks like there is now another cameras that has onboard depth and AI on the market:

Modular-lens 4K Depth camera, here. The specs look quite good actually. And the form-factor is nice.

UPDATE 21 March 2022:
We think we have the tools now to make just simply the world's best depth camera. The how is by using all the onboard AI, CV, and general compute capability onboard to OAK-D to be 100% dedicated to just making the best depth possible.

A bit more on the background effort here:
https://github.com/luxonis/depthai/issues/173#issue-675248313

This also is in response to a bunch of RealSense customers moving to OAK-D, who have entire robotics systems running already where the depth camera is "just a depth camera" and so they are OK with 100% of OAK-D's resources going to producing great depth.

So expect progress on this in 2022.

Cheers,
Brandon and the Luxonis team!