[preseinger]

One interesting thing about Go is that functions are more or less the only way to build abstractions and encapsulate computational complexity. So when you're reading code, if it's not a function call, you can more or less predict it's (fixed) cost. And good function signatures, good program design, where dependencies are explicit and side effects are minimized, does I think let you reliably make assumptions about functions without reading their source. But yeah I see your perspective!