de-Sitter,
I wont comment on the "probable" causes leading to this incident, lot of speculation as usual, except for that regarding the local time this happened and how long their workday/night had been so far tiredness might have played a factor. My experience(25yr ww) is that boredom usually doesn't show up on approach and landing(complacency maybe).
Maybe it makes you feel better knowing that plenty of pilots still hand-fly, usually at lower levels and the flight departments encourage it. This depends on the(expected) workload though, flying into a challenging airport, or just a lot of traffic, weather, tiredness etc or a combination of all, yes, it can get interesting..(SEQM eg)