I fully agree with you about the usefulness of jargon when it's used in specific professional fields. In the fields that concern philosophy, psychologoly and art however there's a lot of sham involved. Supposed to be directed at outsiders, communicative and interacting with a public and clients have developed an irritating tendency to veil, obscure and erode all clear meaning.
Since both art and philosophy have been declared dead more that once, the lame is assisting the blind.