>>14942484
TL;DR
It's magic they ain't got to explain anything
>1
Yes. They didn't have to stop anyone from abusing anything because is likely that special runes where reserved for VIPs. Also Link's could be some sort of a master slate for the hero.
>2
Likely
>3
I don't think just about everyone had access to all of the capabilities of the tech
>4
Probably but I suppose only the most knowledgeable would be able to make custom runes
>5
Guardians have a power core
>6
It's magic
>7
Nothing points to them having TV and Radio but certainly a form of internet for communication but again is all magic.
I doubt anyone within Nintendo ever thought that much through. I know this because the design works for BoTW state that the magic tech the Sheikah use are a consequence of them deciding the game would have robotic enemies (starting with the guardians) and them needing a reason to explain it.
The game doesn't dwell much in any of the "lore" it has, that's the reason is set so far in the future within the timeline, so far in fact that Nintendo don't even want to say where exactly.
But riddle me this, if the Sheikah were so technologically advanced, what the fuck happened to them? Especially when you consider that by the time you're playing their tech is supposedly ancient, while Hyrule is still in middle age's era. So either ancient Sheikah were cunts and didn't want to share or everyone in Hyrule is has an IQ around room temperature.