I like the idea, a lot.
But the way it works now is really easy to make it work on both a mobile and a desktop - just squish sideways and move the sidebar to the bottom. Anything more interesting would require quite a bit of skill and more maintenance work to upkeep.
I expect that the projects that are completely focused on the frontend (the ones trying to do all screen sizes like Blorp or Photon, not the mobile apps) will have more capacity and interest to take something like this on. The PieFed project has a ton of things besides UI to deal with so leaning too heavily into that area would come at the expense of others, which we can't afford to do.