Auto-thrust. I've seen it on B757/767/737NG be very lethargic. Equally I've seen many an F/O be over enthusiastic. Thrust management on finals is a fine art. It's not wait for limits then handfuls on or off. I've watched manual thrust actions where there was no appreciation of what the airology was doing. Changes from tail to headwind with huge thrust changes. Flying through thermals with high thrust changes. Usually it was large reductions of thrust only to find that a few seconds later it was needed to be increased. It would have been better to leave the datum and let the speed oscillate a little with delicate adjustments.
This was educated via non-autothrust a/c and an understanding of the environment. The auto-thrust has no such knowledge. It is a limit system. The pilot who flys with A/T also has no education of the environment.