Ask HN: Why Would I Write Web Apps In Anything Besides PHP?

I recently considered moving all my web apps from PHP to something else, mainly because I was bored and it was an excuse to get proficient with another language. However, the alternatives were not written with web scripting in mind. Python and Ruby were both designed as stand-alone programming languages with web wrappers added later. Beyond those two, I couldn't even think of a third language that was even worth considering. So I stayed with PHP because PHP was designed specifically for web scripting.

My question is: What benefits are there to writing web apps in any of those other languages that weren't designed specifically for web apps?