I do like seeing what features they put in the latest smartphones. But there's also nothing quite like building your own computer. Smart phones are way too small for consumers to do that kind of thing, they have to use custom boards... But with something bigger you can buy the components and custom-build the system yourself. There are also small cheap microcomputers like the Arduino that you can even put into clothing, to control basic electronics like lights or motors.

[ This is way too much info for someone from the 1800s, but Kaguya was almost as bad at technology for a long time and Hayasaka can't let that sort of thing stop her from talking about it. ]

They had some basic electronics with the craft supplies, but nothing with real compute power... Well, I guess I see why they'd want to avoid that. We should be talking to each other and figuring out our feelings, not on our phones running statistical models.