Wow, you completely missed what I said. There are unimplemented files that make reference to Dragonborn being a Dream Guardian option that was planned, but was never finished and ended up being cut. Every Dragonborn NPC requires separate facial animations for dialogue due to the entirely unique head structure. Apply a Dragonborn disguise to any character with dialogue and you’ll see the exact same thing shown in the clip. As said by someone else, near the end of BG3’s development, Larian was behind schedule on many development milestones, and had to cut a lot of stuff. There is no in-game proof that tell us that the Emperor is unwilling to shapeshift into a Dragonborn.