I disagree. Literally billions of people, many of them living on $4 to $10 dollars a day, without indoor running water or reliable electricity, have cellphones - compact computers connecting to a massive global telecommunications infrastructure. Computing capacities (and hence, productivities) which would have had their own floors of buildings and dedicated staff in the 1950s are now semi-disposable consumer goods. Because technology got better.

How do they operate them? Well, through the relatively simple, user-friendly interfaces. How do they maintain them? Well, they're modular and inexpensive - if a single component, like a battery, breaks, you replace it. If too many components break, you just get another one. Of course this does require a certain level of local support and expertise, but no, I absolutely don't think it's that much more difficult than maintaining 19th C. industrial assets, especially because of how fast and affordable modern telecommunications and transportation are. Is it broken? Call an expert on another continent, or have one fly in. Do you need new parts? Already ordered, and they'll be here next week, for a low freight charge. Sure beats waiting for the steamship to come in, or the telegraph boy to bring a message from head office reading "Could not replicate the engine malfunction, please try halting and re-starting the steam boiler."