"EFI firmware should check PCs for known checksums of child porn and report them to the authorities, and why would you want to disable that unless you're a paedophile yourself?"
"This technology isn't reliable. Just today another security flaw was found in the phone-home software that was supplied by a major PC brand, and it's the third one they've had recently. Cyber-crime is the fastest growing type of law-breaking and your bank spends a lot of money on IT security. Do you really want to force your bank to leave back doors so the hackers can get in and empty your account? What about hospitals? A back door there could mean the next big terrorist attack is breaking in and stopping all the equipment working so your loved ones die, without ever leaving their hideout on the far side of the world. Back doors let evil people into important systems to do evil things. The people who want your computer to include a back door are evil and you can't trust them."
Yet we have none of this for the machines that are locked down today.
But most machines sold today don't have this problem. There is still plenty of choice for those who want an alternative. Try locking things down so small businesses can't run Linux servers any more and have to pay a fortune to MS for approved Windows versions, and see how long your plan lasts.
The sad part is that this isn't true any more. A lot of children these days grow up with only a mobile phone, not a PC...
Well, I don't know where you are, but I recently had an interesting conversation about my old school. Back in the '90s, we had a dedicated computer room with maybe 1 PC for every 25 kids in the school. Today, I'm told, the ratio of computers to kids is almost 1:1, and the kids are actively taught how to use these tools in classes, including things like programming, making a simple web site, and so on. Being able to write a mobile app is something a lot of the kids enjoy, because they all relate to that kind of software now in a way that was reserved for the geeks in my generation.
Of course, I have no idea how representative that anecdote might be. It's based on second-hand information, and it's about one school that has always been successful, in one education district of one country. But if it's even close to the wider reality, surely that is a promising sign for the future. Enjoying the benefits of modern technology shouldn't be reserved for the privileged few.