Concisionist
One who advocates practicing concision when articulating feelings, thinking, analyzing, speaking, or writing.
"Concisionist" implies that there are concisionists—individuals who practice and advocate concision when feeling, thinking, analyzing, speaking, or writing, and non-concisionist, those who do not practice concision, and anti-concisionists, those who advocate communicating unconcisely, usually to prevent audiences from learning to communicate concisely and in the process getting smarter. Concisionism is the name for the ideology which advocates concise thought, analysis, speech, and/or writing.