&gt; Stackoverflow was written in C# when the rest of the world had moved on to Ruby.<p>How are they feeling about that decision now?<p>&gt; WhatsApp had clients written in Java against J2ME.<p>Sure, because Java is the only option on those platforms.<p>&gt; JaneStreet is (apparently) killing it with OCaml.<p>OCaml hasn&#x27;t hit its peak yet, it&#x27;s still on the way (slowly) up.<p>&gt; iOS apps were written in Objective-C when the rest of the world hardly even heard of that language.<p>Again, because it&#x27;s the only option on the platform.<p>&gt; This site is written in a niche dialect of Lisp.<p>How&#x27;re they feeling about that decision now?