I realize it must be shocking to see functional programming language geeks solving real-world problems in a pragmatic way. :-) Seriously, though, they wanted t

I realize it must be shocking to see functional programming language geeks solving real-world problems in a pragmatic way. :-) Seriously, though, they wanted to move a large PHP codebase over to a better language, at the scale of a multi-billion-dollar tech company, in a reasonable amount of time. They accomplished this. What's the criticism here?