“Where did all the Sheikah tech and shrines go?”
… is one of the most annoying questions I’ve seen repeated over and over again by people and theorists. Because the answer is quite literally in your face the entire game if you just pay attention to the details.
There’s actually 3 very obvious reasons for the shrines and towers disappearing. And since I get this question a lot, I’m gonna answer them here:
1. They were repurposed by Robbie and Purah.
This is the most direct answer with evidence you can clearly see. Purah and Robbie are still tinkering with stuff, and the Purah Pad is a perfect example of this. It is very clearly still Sheikah technology. It looks and acts just like the Sheikah Slate, but it’s more refined and streamlined. So it’s pretty apparent that since the events of Breath of the Wild she and Robbie have continued their studies and made improvements on the tech.
Additionally every one of the sky view towers houses guardians underneath. This is very clear in the little cut scene that plays out when you activate one for the first time. Guardian legs pop out, and then apply the appropriate gear to you before launching you into the sky. If you pay attention to Link’s reaction as well, the first time this happens in Lookout Tower he is visibly FREAKED OUT by this. No doubt a reflexive defensive reaction to his time fighting Guardians in the last game.
So the tech isn’t entirely gone. It’s been repurposed.
2. It was dismantled on Zelda’s orders.
This is not explicitly said, but it’s heavily implied. Zelda has been traveling with Link since the first game and helping to rebuild Hyrule. Part of healing from a calamity is removing evidence of that calamity so that people can move on with their lives and not be reminded of the thousands that died.
This is also probably because Zelda feels guilty about the role she played. After all she was the one who unearthed the guardians in the first place. She set up the very same guardians that eventually got possessed by Calamity Ganon and DESTROYED THE WORLD.
Also, having finally stopped the calamity it is in Hyrule’s best interest to remove technology that could still be beneficial to your enemies. The last thing they need is another calamity happening that reactivates all the dead Guardians… again. (More on this later)
You can find evidence of this in many places where shrines once existed now only exist an empty patch that resembles the shrine’s shape. These patches are clean, do not disturb the landscape much at all, and it seems much more controlled and surgical compared to what I’m about to talk about in the next section. I believe these patches are where Zelda’s construction team are responsible for dismantling the shrines.
So it’s pretty clear to me that healing the land from the calamity by removing them and any other Sheika tech/shrine would be a priority.
3. Ganon’s Gloom destroyed the rest.
This is also not explicitly stated, but is pretty clear when you examine the facts. Gloom is extremely dangerous. Far more dangerous than the calamity’s corruption. Gloom saps your life away and is the reason all weapons in Hyrule just suddenly decayed when the upheaval happened. It’s so powerful that it literally decayed the Master Sword! The most powerful weapon in the Zelda franchise got instantly destroyed by gloom from Ganon’s initial attack.
So taking this evidence and extending it further… what’s something Ganon would want to get rid of? How about something that could be used against him? Like, say…. The divine beasts and the guardians… or how about a magical shrine that could resurrect a fallen hero?
His calamity form was destroyed by the technology initially, and while he took his revenge by possessing them the next time, the divine beasts were eventually ripped away from his control by Link and the sages were able to fire upon him yet again. So that tech is dangerous and Ganon isn’t dumb. He’s not gonna risk the same mistake happening again.
And there is evidence of this as well. If you travel around Hyrule, in many of the places where Sheikah shrines once existed you will often find bandit camps or giant gloom infestations with sink holes into the depths.
So what happened to the divine beasts and the rest of the Sheikah shrines and tech that wasn’t repurposed or dismantled? Ganon’s gloom destroyed it.
Conclusion.
I know that it’s frustrating that there aren’t many reference to these things by NPC’s. It could easily have been handled by a couple lines of dialogue by a few random characters here or there. But to be honest I look at this as just another puzzle left by the developers.
Like so many aspects of the Zelda franchise, it’s often left to you (the player) to piece together clues and small details to form your own conclusions to things. Environmental storytelling is very much a huge part of both Breath of the Wild and Tears of the Kingdom’s world building. To me the fact that there are so many clues about what happened is an indication that the developers did understand that people would question this.
The problem I’m seeing is that after asking the question “where did all the Sheikah tech go?” people are either too unimaginative or very unobservant, and don’t bother trying to ANSWER that question.
The answer is in the game. It’s all around you. You’ve been walking over it, around it, and diving into it (quite literally) while you’ve been playing.