Yeah, you need to open it to do anything useful. You can use hands free to answer calls, etc. I'd recommend a Wear OS device (smart watch) to bridge the gap as this phone isn't super fast to check notifications or a quick photo/post. Its definitely got a focus on productivity when the screens are open, which is cool, but it makes it less than practical for most use cases. You really have to want this dual screen form factor. Past that it's immensely useful.
You can use the phone as a very very very expensive flashlight without opening it by double tapping the power button. So you can so SOMETHING without opening the screen :-). Maybe not that useful, but it's something right? haha