Shoot, you can still buy brand new motherboards with floppy connectors, AGP graphic card slots, serial ports, and IDE hard drive plugs. And all of that 'vintage' technology continues to work just great with Windows XP, Windows 7, and probably even Windows 8.

And if your computer doesn't have any of these things, and you want them, it's easy as heck to add them, as long as it's a real computer with a standard case.
The NUC's graphic connector would be irritating, and extremely limiting. HDMI only. Although I suppose you could buy adapters for other plug types (at an extra cost of course). For comparison my new graphic card, not an expensive model, has plugs for DVI (2 of them), HDMI, and standard D-sub, meaning it's compatible with practically any television or monitor. And if I don't like those choices, I can swap it out for a different graphic card in ten minutes.
The real surprise with those Intel things though is the lack of USB plugs.
Everything these days, as far as external components, is USB. Keyboard, mouse, camera, printer, scanner, GPS, calculator, PDA/smartphone, AV components, card readers, external drives... Even the cheapest laptops have at least four plugs.
-------------
I have a long and hateful history of failed attempts at upgrading or repairing all-in-one computers or "media centers." Software and drivers unavailable, super-expensive replacement parts, unavailable parts, no room for expansion or upgrades, proprietary power supply designs, irreplaceable graphic components, rare memory chips, "onboard" components that require replacing the entire motherboard... Ugh. :grumpy:
The worst were some G3 iMac machines given to me for repair that ended up just going to the dump, although I also get anxiety thinking about a Dell "media center" I handled once.
When you buy machines like those, forget about future repairs or maintenance and consider them disposable.