Hey, relative Mac newbie here (just got my first Mac, 2014 rMBP about 6 months ago) and I'm just kind of wondering...What's the use of Thunderbolt? Tried doing some light research, but most of what I read was tech jargon rather than real world purpose (interfacing speeds and such). From what I did find, most was talking about using it for multi-monitor setups, but why wouldn't you just roll with the much more common, and cheaper, HDMI? If I need it to output 4K resolution, perhaps, but that seems like a super obscure reason for 2 full ports. For storage, zip drives and external hard drives work fine via USB. Yeah, I suppose you bottleneck if your external is an SSD, but the files you need fast access to (like OS) should be on your internal drive anyway. Are there external GPUs that roll with Tbolt? Tho I'd expect those to be extremely expensive. So my question it why? Why do I have the same number of Tbolt ports as the seemingly much more functional USB? Why do I seem recommendations for Tbolt hubs on Mac christmas lists? I do want to be enlightened, but I'm just feeling clueless about it atm. Thanks!