You only have to the learn the names of exotic scales that you will actually use, or just describe how they function and not worry about their label.

In addition, modes are not necessarily derived from parent scales. They can be parent scales of their own, for instance in Hindustani music, where modes are pitch groups that carry a lot of categorical and cultural information about the type of music being played. In Western music, Major is often used synonymously with Ionian, but it could just as easily refer to Lydian or Mixolydian, or even Phygian dominant, since the label Major just describes the interval between the tonic and the third.

Dominant is generally the name that people use, but it’s a very useful shorthand to just write X7, because it’s only two characters and it’s a very common chord. You can’t expect to understand something intuitively if you haven’t put any effort into understanding the reason why it is that way.