I think really, there are no "pure" styles. It's only a matter of how long ago changes were made, and where they came from. There's nothing wrong with modern "hybrid" styles...only time will tell how effective they are. The styles we think of as "pure" or "traditional" made innovations and inclusions long ago, since they have lasted the test of time they are accepted as beneficial changes. All martial arts are evolving and changing all the time, with every new generation and teacher. How much there is to gain depends on the quality of the teacher.
"I am a servant of the Secret Fire, wielder of the flame of Anor. The dark fire will not avail you, flame of Udun! Go back to the shadow, you cannot pass!"