Thanks DelPrado for the amazing input. It’s always great to read another point of view and the consequences.
Regarding the 180 to 160, this is another I find a bit tricky. If requested maintain 180 obviously I comply. If given free speed it depends. On the the glide, if no traffic or no hint a speed reduction will occur I tend to keep 180ish until around 8NM. If I see there are many traffics sequenced or I listen traffic ahead are getting 160, I start reducing 160 just before the FDP (ie select F2 one/half a dot below the glide), this is because If I’m told at say 10/8NM reduce 160, at average weights or a A320SL the gear is the only way to get a prompt deceleration (fe sometimes at 8NM I push managed speed to decelerate and at 6NM I’m still close to 180). And flying gear down from 8/10NM is not so great....