It's definitely an advantage to know that we might today (for whatever reason) be joining the glide slope from above - or at least it's going to be a close run thing. Then we can mini-brief the technique and talk about other factors which make this difficult such as being on a light weight 319 with no headwind (or a TWC).
Thanks for carrying on the debate guys. As ever there's no finger pointing, just a thirst for understanding....
Cheers
SD