It's not really a game event like an E3 or Gamescom sort of affair, so it's understandable.No live stream at a game event in 2019...? Wow. Hope we don't have to wait too much for the gameplay trailer!
The concept behind MAGIC is, I guess, to allow fans to meet their favourite creators (though this has branched out into Hollywood actors now), attending interview sessions and panels, etc. Live streaming is kind of antithetical to the business model.
It doesn't particularly work with dropping new Shenmue III media I'll admit, but I assume Deep Silver have that covered through other means and will drop the trailer pretty quickly after a MAGIC debut.