The only thing I have ever wanted from phone assistants is to tell me whether a coffee shop was open or not, or what the closing time is. I still can't get this info, nor is this question understood. I still have to stop, launch a browser, navigate to the site, and dig around their website for opening hours, or in the worst case find a phone number and call to ask them.
The one thing that I can consistently get google assistant to do is to set timers: "Ok google set timer for 5 minutes". I want more of that. Could they please just implement and document simple recipes like this? Setting a timer hands-free is already incredibly convenient, and I can only imagine making something similar for a wide host of tasks isn't /that/ hard. I really don't mind if I have to formulate it in a rather specific way, as long as it works and I can find out what that way is.
I wonder if people assume Siri failed to understand the query when they hear its request for clarification. I think it should include some context, eg:
“Which x do you want opening hours for?”