You are quite right start sequence 312, RJAA is totally illlogical in applying this rule on 34 but not on 16. What you didn't illustrate is that on the same approach to 34 with the gear down, you have to delay ldg flap until the OM for noise abatement!
I'm with CX & have been here 15 years; if my memory serves me, the gear down bit was introduced as a trial & is now enshrined in folklore.
Hey ho: I think it was Kipling that said that the graveyards are full of men who tried to change the ways of the East
