What's with the desire for a 4k laptop? The 5.1 megapixels on my 15" rMBP are certainly more than I can see (36yo here). Especially as this guy is looking for a

What's with the desire for a 4k laptop? The 5.1 megapixels on my 15" rMBP are certainly more than I can see (36yo here). Especially as this guy is looking for a 13" screen, and more pixels leads to less battery life, I don't see the draw.