[looeee]

> Modern phones have big enough screens

Not all phones have big screens. Not all people want phones with big screens, and even though it's the current fashion that may change in a few years.

[buboard]

Agreed. But they have high enough resolution to show any website in a reasonable, pinchable way

[kps]

But mobile browsers choose not to. Text too small? All you can do is zoom in and then you're stuck scrolling back and forth line by line.