I'm honestly dumbstruck that people like you are dumbstruck. It's not very hard, and whether you your self use powerful handheld computers/cameras much it's objectively obvious others do a lot. Just do the normal ROI calc. Apple makes a feature for this called "ScreenTime". How many hours a day is the average iPhone user on their phone? A quick google search indicates over two hours. So that's over 700 hours per year, with a life time of at least two years on average.
Do the math. What is so shocking about spending <$1/hour on something so heavily used and important? What price privacy/security focus and long term upgrades? Subtract too the resale value. What is surprising here?