You blank in a meeting. The perfect answer comes 20 minutes later, in the shower or while driving. Not because you didn't know. Because your brain only finds words when there's no pressure. Speaking under pressure is a skill. Skills get better with practice.
POV: You knew exactly what you wanted to say 5 seconds ago.
Someone asks you the question.
Brain:
"Excellent question. Unfortunately, we no longer have access to the English language."