So, how about some evidence for these claims? I'm particularly interested actual double-blind testing of 4K versus 2K displays at "normal viewing distances" which is pretty ambiguous on its own.

The difference between an old 15" MBP and new Retina MBP is easily noticable.

I wouldn't have actually believed it until I borrowed a work Retina MBP for a couple of weeks. Now I'm eagerly looking for an affordable ~27" IPS 4k display to replace my existing monitors.

I kept thinking "I am the very model of a modern Major Perl Framework..."

I am the very model of a modern Major Perl Framework,
But here I am on Slashdot, trying harder from my job to shirk,
From HackerNews to 4chan there's no forum in which I won't lurk,
I am the very model of a modern Major Perl Framework!

So in that sense this is the most elegant natural solution.

You're missing the point.

"Spent" doing what ?

The ACCC a few years back put in a new law (which Apple fought tooth and nail, source: http://www.afr.com/p/technolog... [afr.com]) which required every piece of electronics sold in Australia to have a two year "warranty". I put that in sarcasm quotes not because it's invalid (the ACCC has some *serious* bite here, enough to scare Apple into compliance), but because it's not technically a warranty. It's simply: "a reasonable expectation that an electronic product will be fit for purpose for two years from purchase".

I think you'll find that two years is just a minimum.

Which is to say you could probably argue that a high-end mobile phone would be expected by any "reasonable" person to work for more like 3-4, possibly even 5, years.

If I had an Apple phone fail within 3 years I'd expect Apple to replace it without too much haranguing. Closer to the 4 year mark I'd expect to have to get consumer affairs involved, but still succeed.

You're confusing usefulness with relevance. Thunderbolt is, and will reman, irrelevant to PCs, largely because PCs have plenty of internal expansion capability and sufficient USB ports, Display Ports, HDMI ports, etc.

Not often I wish for mod points and don't have them, but this pretty much nails it.

Thunderbolt is solid technology - basically PCIe on a cable - but its relevance to machines that don't need PCIe on a cable (or provide an equivalent - ie: a docking station) is close to nil.

The use case for Thunderbolt on Macs, due to their typical design focusing on form factor over other factors, is reasonable.

The use case outside of Macs, is niche (to say the least).