What's wrong with automation?
The autothrust does a much better job than any human can. It's inputs are much more current and accurate and it frees you up for other tasks. A pilot can only assimilate so much info and at a much slower rate. Where is he getting the info from? The tower wind is not at the threshold and is several seconds late plus it is rounded of to the nearest 10 degrees and nearest 5 knots. The INS or GPS data is much more accurate and this is what the automation uses so unless there is a malfunction I can see no cons to using the automation.