Osmand doesn't appear to be able to locate street addresses. Like if I input something like "123 4th Street" all it can do is offer some cross streets, which may be miles away from my intended location.
Is there a way to augment it's data so street addresses work? Maybe there's a service I can add?
Similarly, it doesn't know the names of many businesses.
I have found this app to be absolutely worthless when it comes to finding anything. It does a great job of showing where you are. I really wanted this app to work and it has potential. But until you can type a physical address and get a location, the app has no real utility.
If it can't find it, it's because it's probably not in OpenStreetMap. Same thing for businesses. It's our collective responsibility to fill those gaps as a community!
So start editing your local map on OpenStreetMap.org, you can also join local communities that will help you out on your doubts.
You can add missing data by yourself. Start with StreetComplete app for address numbers and https://www.onosm.org/ for businesses. If you want to go deeper check https://learnosm.org/en/
So its basically useless if I don't know where something is in gps coords. There's got to be a better way than osmand users manually putting in addresses.