I think they understand that, and are referring to more nuanced side effects. Logging, for an example, is a side effect, same with even using a date function. H

I think they understand that, and are referring to more nuanced side effects. Logging, for an example, is a side effect, same with even using a date function. Hitting an API endpoint without cache may be functional if the response never changes, but do you want that? Usually we want a cache, which is skirting idempotency. The closer you look, the more side effects you see