Being abstruse is a character "vice of deficit" stemming from what would otherwise be a character virtue in the form of elegance. It is intellectually narcissistic, which is to say that it contains either the intellectual narcissism of ignorance or prejudice. One may be ignorant of the maturity level of the audience for an elegant idea, or may be prejudicial against those who can't understand and process more complex concepts, just ignoring the language translation to more simple terms that they could otherwise understand and which appeal to them at their maturity level. It is then a common branding and marketing mistake made by academics and other complex thinkers who try to get their ideas across.
Someone who is "abstruse," is by definition, confusing in their complexity of communication. However, all human beings communicate on a spectrum between being overly simplistic, and overly complex to match the needs of their audience. This highlights the central psychological skill within maturity, which is the Observing Ego to scan the environment for its composition and needs, matching that to what we endeavor in that social environment.