Instead, it's a guessing game about syntax and semantics, and frequently a source of frustration. There are many failure points: it can "hear" you wrong, it can miss the wake word, it can hear correctly but interpret wrong, miss context clues, or simply be unable to process whatever the request is. In my experience, most normal people either relegate voice commands to ultra-specific tasks, like timers, weather, and music, and that's that. Google and Alexa are relatively good at "trivia" questions, but Siri is a complete failure. All systems have edge cases that make them brittle.
I think there's potential here. Cortana was the most promising: an assistant that's integrated into the OS and can change any setting or perform anything on-screen would, again, be really awesome. We just don't have that. I think maybe OS-wide + GPT 4 (or later) might get closer to what we expect, but it's just not great right now. I really want to be able to say something as unstructured as "hey siri, create alarms every 5 minutes starting at 6am tomorrow" or "hey siri, when I get home every day, turn on all of the lights, change my focus to personal, and turn on the news". There /is/ power to-be-had, but nobody has really tapped it.