RayshardT
The point that Messages is the default and can't be changed is a valid argument for being anticompetitive in the iOS messaging ecosystem because it's makes it such that you can't fully switch to a different messaging app. A different messaging app that can process SMS/MMS should be able to be the one stop shop for such data but Apple forcing users to use Messages which does nothing to make the SMS/MMS experience better. Even though SMS/MMS is an outdated technology, other apps could provide better user experiences. For example, in Google Messages on Android, emoji reactions on SMS are intercepted and displayed in a more friendly way. Another example would that another SMS/MMS app would inform the user to send a video via link instead of MMS to preserve quality.