Actually it doesn't unless you're assuming eager evaluation and that 'arr' is something like an array, rather than something which monadically collects functions for evaluation later.

In C#, the functions being passed could be passed as analyzable syntax trees, and the implementation could actually be in SQL.

nope. Sequencing and imperative have an overlap, but they are not the same thing.

Sequencing is a fundamental computing construct. Data flow graphs allow you to specify sequences, just as shell pipelines do. SQL has sequentiality built-in with nested queries. None of these are imperative environments.

> it still specifies the order of operations

Yes, although not necessarily all of them. Some languages will process this eagerly, some lazily.