Open hours is a task in StreetComplete, so that's covered. For additional metadata you'd probably have to use something like OrganicMaps and be logged in there. It's quite possible to add the data if you want to, even without going to the computer and doing it from there.
Just noting that while Organic Maps does allow a pretty good level of editing, it's not a feature complete map editor. There are many others apps/sites that are purpose-built for editing if you need more functionality. i personally use Vespucci on Android.
Totally agree with you, I just think we should be forthright about each tool's capabilities.
In my personal experience, after a few days of use (going down my block adding stores) I realized that there were certain things I couldn't add/change in OrganicMaps so I needed a different tool.
That said, it's still the first tool I reach for since it's so easy and user friendly.