> Music, podcasts, television all hinder the practice of introspection.
For you. It hinders the process for you. Some people think better when not in complete silence.
Anyone that tries to speak broadly and paint everyone with the same brush when talking about neurological phenomena is clearly completely out of touch with the subject. The mind is a wonderfully complex and wholly unique thing. What works for one might not work for another.
This is a pretty well studied and researched area. It is in the research almost universally accepted that silence or white-noise is the most conducive environmental soundscape for introspective thought across all groups.
Can a person who spent their entire life in a low sensory environment have a lot of worthwhile introspection? I think even the low sensory cave children have a form of council.
People go to therapy, group therapy, read, etc in order to have thoughts of others that seem rather important to introspective thought to me. I don't think all audio media and forms of listening would fit, but I don't think all wouldn't fit as those important inputs.