UKA,
as I remember (about 7 years ago???) when there was a pink/yellow/blue, what ever it was, issued stating not to remove speed 'til round the corner it was primarily due to noise tracking and those nasty little reports that appeared every now and again saying ABC123 left the NPR track. The airlines get fined, look into it, and discover we said no speed, so blamed us. This was overruled but a reminder issued to 'help' by delaying the no speed til turn complete.
Yes it also helps not to hit the LL RMA/deps but I think safety was secondary to appeasing noise lobby on this particular one.
I may of course be wrong, memory not what it was in old age and all that...