It doesn't just take more time; once something is sufficiently difficult, it goes from incrementally time-consuming to insurmountable (for most people) -- it might as well not exist.
They still won't have ultimate control, but you will. This is certainly a tradeoff (a personal relationship has more motives for violating trust), but depending on your relationship it can be a great way to distribute control away from ApplNSAoogle.
On the other hand, it gives us things like AWD, so people don't need to be afraid of when they should use 4WD or when doing so might damage their car. It's automatic. It allows people with disabilities to operate a car, since they don't need to shift or use both feet on the pedals. It's automatic. You can hook up your iPhone and play music from it without touching the phone. It's automatic. And even slippery weather isn't as deadly anymore with automatic traction control.
So no, I can't rip my car down to the chassis and count every bolt. But I can drive a car in a far more safe manner, a car with far more power and far more convenience. There's two types of "control" at play. One is a mechanical control where I could tear down my Toyota 4Runner SUV with 180hp (a small amount of power) and put it back together as a Tacoma pickup. The other is the knowledge that if I hit a slippery patch in my Nissan Murano with 260hp (a huge amount of power), I will continue on just fine even with more power under the hood while the Tacoma driver is in the ditch wishing he had known to engage 4WD at that second. The news will report that the Tacoma driver "lost control" of his car, whereas the Murano driver "stayed in control".
Now that's a bleak picture, sure. I'm just using it to illustrate a point. There are two types of control. You'd never give root access to an average user. So does the Linux computer actually give them any more control? Or are you just giving them a Tacoma and locking it in 4WD for their own safety? If you give them a Corvette and then tell them to be careful or they will spin out and die, they will never let the RPMs go above 2k.
Facebooks also works that way, now that I think about it. It takes control away over your data, but it enables you to interact with more people, which may improve your control over your connections.
Could we agree on that?
For the record, I use a Linux laptop at work. When I get home, I enjoy sitting down with an iPad and an Xbox for entertainment. I have a 16 year old truck for the weekends and a brand new Fiat for my daily driver. I understand both sides of the argument, and they're both valid.
That said, I don't mind consuming digital volatile goods - there are very few books I re-read and I usually acquire paper copy of those.
Depending on what kinds of books his parents read those might result in more control too. Even if we account for a loss of control from the computer to the iPad (and I am not entirely convinced that a practical loss happens, given that they can barely use the computer) it isn't possible that the total amount of control, for his parents, go back up.
You are right that people don't care about control as much as an idea of it. And you are also right that giving control to someone else who can get a value out of you might result in you being able to do more, but at some point having no control over ones life will bite people in the ass. And that's what the control topic is about.
In a simple example Apple can decide to not show the books to your parents any more. There is nothing they can do about it. Getting your Linux computer to work right takes time but then it's much less likely that a software can delete your data or if they delete it you are more likely to have a backup because you put sweat into configuring your system that way.