What is a word that means when people only contribute or speak when they have something of merit to say or add?
Solution 1:
pertinent
: pertaining directly or significantly to the matter at hand; relevant (Random House Kernerman Webster's College Dictionary)
apropos
fitting and to the point (American Heritage® Dictionary)
pungent (or poignant)
: being sharp and to the point (M-W)
Solution 2:
People who contribute something useful are being constructive.
Solution 3:
I believe I found the word: compendious