It's a recton. Don't remember the exact chapter but in this page:
Late 600's
Pretty self-explanatory. Don't even know why Sarada should be having that sharingan in the first place, it's bad news. How she unlocked it the way she did just discarded what the manga already established....kind of a big insult to the other Uchiha's who had to experience horrible things to unlock theirs too!
Oh wow, lol! Seriously, a cheating device? Technology? For jutsu? That's even more ridiculous. How does that make any sense?
Oh my mistake. I just grazed that chapter because the Uchiha bore me and I don't care for all that text. The one thing I understood was that Uchiha's need to experience strong emotion and I thought the hatred/loss was only for developing new powers of the sharingan. Again, my mistake.
However it should be noted that that page itself is a retcon. Sasuke first activated his sharingan (that we see) when he thought Haku was going to kill him and Naruto. He didn't actually lose anything, I think it was the desperation, fear, and determination that pushed him to unlock it. The whole Uchiha thing is a mess and it had the most pages dedicated to it lmao.
Yea the guy who invented it did so to make training a thing of the past apparently. What's worse is according to a summary, the guy who made it was a decent but arrogant guy. Totally harmless, just a little thoughtless with his words when speaking the leader of all the ninja.
As a matter of fact, imagine how much more sense would be made if HE caused the conflict. What if the plot went something like this?:
Thanks to all of the treaties, trade between all nations is booming. Therefore, escort missions and deliveries are at an all time high and are in fact the only missions available. Naruto is working so hard at the office because of the high volume of missions he has to hand out. But he works so hard at it out of the affection he has for the ninja profession. Being a ninja was his whole life (literally) and with wars being a thing of the past, he wanted to keep the profession relevant. No one needs to hire assassins anymore, they just need someone to keep them safe from the occasional bandit. Chuunin and Jounin are a bit restless, but it gives Genin something to do. Ninja go to the academy to learn how to defend yada yada.
However, out of the village comes this kitten. He says with his invention, civilians will be safer than ever because they can use jutsu at the push of a button and no longer need to spend so much money paying a ninja to escort them to a destination and back.
Naruto is against this obvious reasons and then we get a movie with message about how careful we must be about technology (since the technology in Boruto seems to be a sore spot for even the fans). In addition, action can come from the idea that selling such obviously dangerous technology to just ANYBODY will lead to misuse or it falling into the wrong hands. Someone setting it off at the wrong time (during an argument on accident, blah blah) could lead to an actual conflict.
Boruto's story could be him and Naruto learning once more about the importance of forgiveness and how revenge is NOT (always) the right answer. Boruto could argue that the conflict is necessary and Naruto could argue that a peaceful resolution can be reached. And the ninja are in conflict because again, the older ninja remember the glory days of fighting for your home and younger ninja would be scared or excited about possibly having to actually fight.
It would be a way he could properly teach the lesson he's been trying to teach the whole manga (and failed at).
I don't know what hurts more. What we actually got, or what we could've got.
Also, personally, I think he would've found a lot of success and NOT piss Naruto off if he made it to be some kind of home security system. Robbers would be the thing of the past.