I asked myself the same question about 10 years ago when Ruby on Rails first blew up on the scene and all the devs at Wordcamp were doing seminars on switching their stack to it. It was hard to envision why people would leave PHP for another language. And particularly at the time, I was just learning PHP, so it pissed me off that I had to learn yet another language/syntax 😣
Now reflecting, I see it like the emergence of Node. People dropped other languages like hot potatoes because of the ease and simplicity Node exhibits for certain functionality, and it's efficiency in accomplishing them (compared to PHP). Sure, I can build an API in PHP, but I can build it in Node/Ruby and have it scale better -- and interact with other devops services (possibly in other backend language I might prefer too like C or Python).
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