The critical viewing scenario is two files displayed side by side. This is very useful, but having to side scroll makes it less useful. So when choosing an opti

The critical viewing scenario is two files displayed side by side. This is very useful, but having to side scroll makes it less useful. So when choosing an optimal maximum line width per file, pick an optimal display width and cut that in half. And if I'm a coder on your team, please pick the optimal display width using a 12 inch 1080p laptop screen. Also, pretend that your vision isn't 20/20. Thank you. Bottom line, 80 columns isn't unreasonable.