I can use third party tools to remove the mp4 and then edit it. But this post is not about the technology, but about the business issue for Adobe.
A Pixel user can edit the moving photos on her Pixel phone, or for all I know, in Google Photos. But she cannot see or edit them in Lightroom. This seems like an obvious ploy from Google to move Adobe users from the PS/LR ecosystem to the Google ecosystem.
I would think that Adobe might be worried about that.
How might Lightroom display a jpeg with an embedded mpeg? I think it should show each frame of the mpeg as stacked photos. It would also be nice to export frames and then delete the mpeg, which is very large.
If it's any encouragement, I hate exporting frames using the Pixel phone. It is so small and fiddly.