We recently began work on a mobile app version of our web-based kanban board application. We ended up spending a week on react native, then switching to Cordova, which I don't agree with 100% but you're dead on about the ups and downs. At the end of the day, a 2nd code base, even if its similar to our web react code base (and even if you can share all your state management code like we could), is still a 2nd code base.