Well that's true on a certain scale. There is no way I could have completed some projects with a small team, in a short amount of time if I had to use some like Go or Rust. Ruby,Python or PHP are useful for what they are good at : "front-ends" (on the server). So is Java by the way, but while Java is fast it eats way too much memory while doing nothing. Again, at a certain scale , developer cost VS performance cost is a reality. It's not very useful to boast about chosing Go or compiled language X or Z while your competitor can bring an app into production in 1/8 of the time it takes to develop the solution in PHP.
AFAIK Parse.com spent a year rewriting their Ruby app in Go. In the meantime, there brought no new functionality and then they just closed shop. Sure they got to write a fancy blogpost about how successful they were with Go. so successful they rewrote their app in nodejs when they decided to opensource it.
> So developer unfriendly + server unfriendly
How is PHP developer unfriendly ? It has 15+ years of libraries to do almost anything. You should probably have a look at PHP7 before passing any kind of judgement.
How is it server unfriendly ? PHP is with Java the most deployed language in the world.