[da-anda]

The second I just can't understand. Not on the Pi side as that's great. But WTH can't we get much bigger and more powerful systems to do the same? Not a question directed at yourself, just in general.

They could do the same, but they would a) either also rely on HW capabilities, which is hard to figure out on HTPCs with randomly crafted HW or b) have to do it in software, for which NO open source code exists yet - thus we can't implement it.

So a follow-up, when MVC is played back is it done and recognized by Kodi like a SBS 3D video is? Does it also bring up that annoying 3D notification and sound? Or does it just send out the image and let the display decide to show it in 2D or 3D by either auto-detect or manually changing the 3D format?

The Kaitoast (along with the bing sound in Confluence) will still be triggered and the MVC videos will be handled just like any other 3D video recogniced by Kodi. If you don't want the sound just turn GUI sounds off. And if you don't want the dialog asking which playback mode to use, change the according setting and set it to "use preferred 3D mode" or "monoscopic 2D" - whatever you prefer as default playback mode for 3D movies.