The most common criticism in practice tends to be a strong aversion to mutability. Compilers can be thought of as a series of pure functions transforming a larg

The most common criticism in practice tends to be a strong aversion to mutability. Compilers can be thought of as a series of pure functions transforming a large immutable data structure, and given the practical issues of mutability (reasoning about it is legitimately hard), this can give a lot of languages a strong aversion to mutability. However, there are some domains where you can't transform the problem space into consume-and-produce-immutable data structures and expect anything close to performant--databases are a good example here.