That article is out of date. As of September 2017, FB has re-licensed React under the MIT open source license and dropped the patent stuff.

I don't think you contradicted anything I said. I would say special camera apps, multi-threading etc. are not needed that often.

As for slower build times, that is the beauty of RN. Building is not needed most of the time just an initial build and a rebuild every time some of the base configurations change or you are creating code outside of RN.