With regards an APT for Windows, I don't see how that wouldn't be possible to add to Windows as a third party thing. With a nice GUI and search and a default catalog of quality mainly OSS software with no toolbars or BS and have it also keep everything upto date.
That way you could just install it on all of your relatives who use Windows's computers and tell them just to download everything from either that or the MS app store.
So, basically, burn respective .iso to a USB key, boot from it, install, enter the key from the sticker on the bottom of the laptop - done. Caveats are (a) limited choice of languages (b) lack of some brand-specific drivers, but if you run English version on a common laptop, it's very straight forward.
I noticed that starting with Vista, the distinction between OEM vs Non-OEM key seems to have been reduced. This makes life easier when there is no recovery partition or the hard-drive is hosed. Whereas with XP, you did have to use an OEM version for the key to work.
I have not had any issue validating windows using the above versions of Win 7, as well as a few vista cds that I believe are retail, as long as there is an OEM sticker on the laptop. Every so often I have to call in and do the automated telephone activation, but they are valid CD Keys and I think that is probably tied to how often the key was activated.
Having said that, at least with Vista, the disc the manufacturer gives you is often locked to a specific laptop/bios/board.
reason number 1001 why I hate windows
So, not your phone number, or the match of the given code with your computer's IP and usage when you go online?
and then there might be a specific patch or workaround that's been applied by the oem that keeps the computer from exploding, but they sold it anyway because you can blow yourself up as much as you like AFTER voiding the warranty.
That's not a clean install.
A clean install is buying a retail version of Windows and blasting it down on your HD.
Recovery DVDs recover what the hardware vendor put there in the first place.
Or you can buy a computer that doesn't come with Windows in the first place.
You can wipe a Windows 7 install and do a completely clean Windows 8 install.
Now I think about it these just seems like such an obvious idea that I'm surprised nobody ever did it.