Experts pretty much all agree that kids need some level of autonomy and freedom to grow up healthy. The exact level is under constant debate, and at what age things are appropriate is under constant debate. With freedom and autonomy though will come accidents. It's an unavoidable consequence. There's no way to be absolutely certain that a particular kid won't make a terrible lapse in judgement, no matter how much you've drilled something into them. Hell, even adults make those kinds of mistakes all the time.
Put another way, I could keep my kids very safe by keeping them in the house, tethered to an iPad all the time, unable to leave my earshot, like so many parents seem to do now. They'd be super safe. And they'd grow into the kind of inept, stunted kids that people are constantly complaining about.
To be honest... If tomorrow WINE was 100% perfect, we'd probably see laptops start moving the direction of phones and it would be terrible for consumers. You'd get your AceOS on your Acer laptop and DellSys on your Dell and so on and they'd all have little marketplaces where you could install LibreOffice next to an ad for some other office suite that costs $100 for some reason and that's all people would know.
Yes, techy people would have more options but for the average consumer, they have no idea what an OS is. Many don't know what Windows is. They don't care or want to care. If presented with the average Linux install screen, supposing they could make it that far by figuring out how to make a bootable flash drive, they'd freak out at all the options and information presented. They're at the mercy of the manufacturer, and the manufacturer will want to squeeze out every last dollar, and being given control over the OS would be terrible.