I've said this before, & it wasn't very popular (not that that's ever stopped me before) & I'll say it again... I'm convinced Taylor's hand-eye is not quite as sharp as it used to be. And before people start freaking out that I'm saying he has a bad eye, I'm not. He still obviously has exceptionally good hand-eye coordination, but these things are relative & some players deteriorate slightly earlier than others.
Taylor's biggest asset when he first burst on the scene against the Windies in '06 was the kids incredibly good eye & fast-hands, I remember his 1st or 2nd innings when he scored 30 odd at better than a run a ball, and distinctly remember him pulling fast bowlers effortlessly off the front foot, with those incredibly quick hands.
I think the fact that he was arguably the best slipper going around between 2008-2012, yet in the last couple of years he's dropped more than his fair share also adds a little to this argument.
FTR, I do think if there has been a slight deterioration, is it absolutely microscopic, but that's enough sometimes to make a slight difference with someone who used to rely almost entirely on his quick hands/eye.
To compensate for this, he's really improved the technical & mental side of his game hence why he's a much better test bat nowadays, but in terms of pure hand-eye/bat-speed, I think he's declined slightly.
Now runs away...