I almost forgot the most important piece of tech in any royal toolkit: the ubiquitous datapad. We'll call them wisepads.
Here's an example scenario regarding wiseeyes and wisepads. Apollo and his chief of staff, General Acrisius, are walking to the study and an aide comes up and hands Apollo a wisepad with a text message from Mama. Apollo reads it, then hands it to Acrisius to read, too. If I try to use wiseeyes, the aide (wearing wiseeyes) would walk up, make some gesture to transfer the message to Apollo's wiseeyes, who subsequently transfers it to Acrisius. But! What does the aide do if he just woke up Apollo and he isn't wearing them? (I assume their removable so they can be easily replaced and/or confiscated for security reasons.) Should the aid carry a wisepad wherever he goes in case the emperor is not online? (I ignore the case where Apollo is always on with the palace AI (mindmeld), since advanced AIs have a habit of coming alive and causing havoc at the worst times.) But, a simple rule in Apollo's inbox to notify his wiseeyes when there's a message from Mama is all it takes to put the aide out of work. And Apollo could use his wiseeyes virtual buttons (I don't like hand gestures, too tiring) to forward the message to Acrisius. But! Watch out for door jams and droids, because you're going to bump into one if you're reading while walking. But! The wiseeyes could potentially be configured to warn him when he's about to crash into something or drop through a manhole. What about wiseears and wisemouths to carry on fully immersive conversations with anyone anywhere? And if everyone is sporting these Acme goodies, then there is no more need for 2D or 3D displays.
My head is spinning....