Boycott US

A lot of addresses still need to be added to OSM. If you sign up for an OSM account (really easy; no BS, no dark patterns), you can add these addresses through the editor. In iD (the built-in web editor), this is done by clicking the building etc. and adding a street number, street name, optionally unit, city, state, and zip code if applicable. Once these are added there and published (plus maybe about 10 minutes for the editor to update), it'll show up in the app (at least for me; I use OsmAnd downloaded from F-Droid). I do this whenever I'm about to go somewhere like a business etc. to see if the information is there. It takes about two real-world minutes and helps fill out the map. This can also be done through third-party, FOSS mobile editors like Vespucci (Android), StreetComplete (Android), and Go Map!! (iOS). This confused me at first too until I realized "Oh, the data just isn't there, but I could add it."

This is tougher than using GMaps, although there are ways in which OSM already curbstomps GMaps (maybe I'll write a post about it someday), and there are huge benefits to having this information in an open dataset rather than behind Google or Bing's closed crap. These include (for reasons I won't delve into unless asked) accessibility for the disabled, sovereignty from corporations, much more detail (compare the same area with GMaps sans the satellite view and OSM), an open dataset for research, disaster response, conservation, and (funnily enough) walking and cycling, the last of which in my experience is strictly better than GMaps provided OSM has adequate (read: a normal amount) of data to work with. For an explanation of the last one, GMaps often recommends downright suicidal routes that take longer and go farther than OSM. Every time GMaps has offered me a better cycling/walking route in my area (but was still abysmal), I realized it was because OSM was missing something; adding this something immediately shot OSM's route ahead of GMaps'.

I genuinely believe that OSM will steadily outperform GMaps in more areas as data is continually added. Sort of like what happened with Wikipedia and Britannica.

(Edit: god I wish I could show you my area now that I have it more-or-less fully mapped out and the routes without doxxing myself. GMaps just shows a near-blank blob without the satellite, whereas OSM is entirely readable without that. GMaps' cycling route takes me biking through a huge, dangerous, sprawling parking lot to lose time and 0.1 miles while OSM takes the optimal route down a cycle path. Everything is perfectly documented. It's glorious and makes GMaps look like child's play.)

Yeah I've had exactly the same experience. I think it's an OM UX problem, not an issue with OSM itself.