I don't get why this is a problem - almost everything that comes with default Emacs installation is not loaded by default and so you don't even need to know it's there. Or you can just remove these modes altogether from your installation, no problem. On the other hand, if something made it to the Emacs core, it's probably more stable and easier integrated with other plugins. There are many plugins in the wild which do a great job by themselves, but fail miserably in the presence of other plugins enabled, and such plugins are not in Emacs (or I didn't see them yet).
I don't get why this is a problem - almost everything that comes with default Emacs installation is not loaded by default and so you don't even need to know it's there. Or you can just remove these modes altogether from your installation, no problem. On the other hand, if something made it to the Emacs core, it's probably more stable and easier integrated with other plugins. There are many plugins in the wild which do a great job by themselves, but fail miserably in the presence of other plugins enabled, and such plugins are not in Emacs (or I didn't see them yet).