For me, that is a selling point! Widescreen is nice for movies, but when coding or browsing more lines is way more useful.

Hear, hear! When coding (or reading) vertical space is much more important than horizontal space. Reading 300 characters wide is impossible, consequently also code also has to have shorter lines. So if your screen is ultra-wide, you either split it into areas (for which laptop screen is not big enough) or just waste a part of it. Vertical space, OTOH, is almost always used 100%. That's why I have all my widescreen displays in portrait mode too - still enough horizontal space and amazing abundance of vertical space!

On the other hand, on a 16:9 or 16:10 screen you can have two windows side by side and still get enough horizontal space to read enough of a line.

Still possible with 3:2. You dont lose the horizontal space.

On a standalone wide display I did that, but on a laptop it never really worked for me, it's usually not wide enough.

It's still not as "square" as 4:3. Besides, why not. Other devices have huge black bars around the display.