There's nothing bad providing you're using the native language of the platform. With React you have to go through bridge code to communicate with the native con

There's nothing bad providing you're using the native language of the platform. With React you have to go through bridge code to communicate with the native controls. So there's a level of indirection to and from the native control. Flutter communicates with its widgets directly so there's no level of indirection. The other major advantage is that it compiles to native code so performance is always going to be superior.