I don't agree. First of all, we have been selling general purpose computers for decades to grandmas and grandpas and unless they have some really nerdy grandchildren, the chances their computers will suddenly spawn Slackware is close to zero.
In fact this consoles/open systems these days are even harder to mess with. You have have a setting hidden in some deep menu that's like "Unlock the bootloader" or some such, that is like "Are you really sure you want to do this?". That's pretty much how PS3/open Android devices do it. Even if you do that, it still doesn't change anything. You still to go through a whole lot of random steps (including downloading lots of random software) to change anything, ie. just like a regular computer.