Thanks for all the comments, lots of interesting points for me.
If you start to slow at 4.2-4.5 you’re not going to lose more than 10kts by 4d and that’s fine, it’s the ones that start to reduce at 5.5 or more that ruin it for all.
I understand the stability criteria and it must be very tempting to err on the side of caution but slowing early is not a ‘victimless crime’ at busy airfields and I’m surprised the airlines haven’t identified this as an area to improve and find a better balance between stability criteria, fuel burn/noise on approach AND landing rate.