The main issue with CSS is that you have to take old but not yet deprecated browsers into account. And even now, you have to take into account different devices

The main issue with CSS is that you have to take old but not yet deprecated browsers into account. And even now, you have to take into account different devices, different sizes, different resolutions. But I agree that's its not the usual language. Instead of writing words at the computer and have it compute it, you have to compute everything yourself in your head and output the script that do the display. Things like SASS and LESS are a godsend.