One codebase sounds great but I always feel devs try to ignore that there just are significant differences between platforms that you must address if you want a well integrated app. Writing separate codebases in native iOS, Android, and web has a huge amount of waste but you can achieve higher quality and os integration, writing react native and react on web means you get just 2 codebases and higher dev productivity but at the cost of pain in libraries which typically also means less native integration, the solution proposed here means 1 codebase and even less native integration. If it is right for you great but like everything it is tradeoffs, pick your poison.