[ken]

I find it difficult to write code on even a 15-inch MBP display. It feels very cramped to me. There's barely room for 2 adjacent windows, so I spend all my time scrolling and switching desktops and re-layering windows.

13" is barely bigger than the 12" display on my Apple IIgs (late 1980's), or my first laptop (mid-1990's). That was a perfect size for a VT100 emulator (it's the same size as the original 1978 VT100!), but that's not how I write software any more.

The same size screen is actually relatively worse than 20 years ago, because these days all documentation is online, so it has to share my screen.

[arvinsim]

Same here. It's painful to write code in the 13" screen that I always connect to an external display if one is available.