I'm not sure people have this idea that a JIT or AOT compiled version will come along; certainly ten years ago nobody really had that impression, has the rise o

I'm not sure people have this idea that a JIT or AOT compiled version will come along; certainly ten years ago nobody really had that impression, has the rise of the JS VMs really changed this so much? To take FB as an example: AFAIK, it was written in PHP because Zuckerberg knew PHP. There was no expectation it would "come around" and it continued to be in PHP because bills had to be paid and rewriting everything would stop new features from being launched and hopefully reach profitability. If you're a small startup your first goal is almost always to hit profitability, and then your goal is almost always to maintain that. As a result, language choices are frequently made by what founders know rather than any technical merit.