Surely the Ruler of the entire universe could do better than this!
Of course, He could and can, dear Terry (peace to you!). It isn't He that's limited, dear one, but earthling man. He gave them a demonstration in a way that they would understand. It sounds primitive... because it was fairly primitive times (at least in comparison to today's world).
Yes, yes, I know... so why doesn't He just bust out with some pyrotechnics in the sky... or start calling folks on their cellphones... or something like that... today?
Because... and I know this is SO hard for you to grasp, but... His means of communicating with earthling man TODAY... is so far past anything our limited thinking has been able to come up with to date. He doesn't NEED a pantomimic drama... or an audio/video apparatus. No "smart phone"... no fiber optics... no satellite. No 3G or 4G... no super processor... no nanochip. Nuthin.
Except His Son. He just uses His Son.
TRULY "advanced" technology, dear one.
Again, I bid you peace!
A slave of Christ, the ultimate "microphone"...