There are a few reasons I would recommend deep linking over implementing support for universal link into your app. Firstly, universal links are somewhat more complicated to set up than classic deep links and might make the development process more difficult. Their functionality is also somewhat similar to deep links. Secondly, they only work for iOS which cuts the number of viable users by a significant amount. Generally speaking, I would recommend implementing universal links after your system of deep links is constructed, in case you want to invest extra effort into your iOS application. Overall, it is definitely not an unuseful feature, I would just prefer deep linking for React Native.