The Annese can tie elaborate knots that melt on a tug. This implies more than adequate dexterity to use tools.
Their awkwardness is probably due an apraxia - a brain deficit that makes it difficult to plan motor actions to complete a task.
In humans, this deficit is usually caused a specific part of the brain being damaged by a stroke or brain tumor.
In the Annese, I suspect that this brain deficit is intrinsic to their normal (at least normal to an Annese) neurophysiological makeup.
Since it is intrinsic to their nature, it's a pretty good tell as to who is Annese. Kind of like the stiff, deformed pinky fingers in the aliens of Roy Thinnes' The Invaders.