The sooner they accept that there were no such thing as one language to rule them all, the better developer they become. I have never seen the "isomorphic" claim to be seriously analyzed. One aspect example is how much logic behind the wall is overlap with the optimistic ui logic? Some logic may seem reusable but it may not. It's insane when I saw a popular js framework author on twitter said javascript is a language of the web, other backend languages are not (not exact words). Like WTH.