Maybe writing speed is a bottleneck for programming

> It finds that developers spend only 5% of their time editing. It also finds they spend 14% of their time moving or resizing editor windows, so I don't know how clean their data is.

APL and similar array languages allows a lot of improvement on both metrics, as a handful of symbols may pack the equivalent of many LOC in more verbose languages, and it's common for the entire program to fit a single screen. That such languges failed to take over make me believe this probably not the narrowest bottleneck.