I bought a new 2015 model, although in my case the Touch Bar was the main reason -- I absolutely hated the new keyboard layout (lack of Esc, no physical functio

I bought a new 2015 model, although in my case the Touch Bar was the main reason -- I absolutely hated the new keyboard layout (lack of Esc, no physical function keys, arrow keys are now arranged in way where your fingers can't easily find the right keys without looking down). Unfortunately, turns out they're no longer made with a discrete GPU -- they only have an Intel Iris integrated graphics chip now, no AMD Radeon. The discrete model was discontinued in 2016. As a result, graphics performance is horrible. It's especially noticeably bad with the scaled Retina mode. I have to use the scaled mode on my external 4K display because otherwise the UI becomes so small the text is unreadable. That's when you realize that Apple's approach to resolution independence is pretty crappy. You'd think they could just run in 1:1 and just render text, buttons and so on a little larger, but that's not possible.