Agreed, so much so that I gave up on 4K, scaled it to 1440p just to get 60hz on my (now-dead) 2013 rMBP with my external monitor. Recently bought a second-hand

Agreed, so much so that I gave up on 4K, scaled it to 1440p just to get 60hz on my (now-dead) 2013 rMBP with my external monitor. Recently bought a second-hand perfect condition 2016 MBP with function-keys, and it's been brilliant so far, and I get proper 4K :)