The problem with compressed loads is that sometimes they will push the bullet forward over a period of time. This can be a problem if you are feeding them through a magazine...not much of a problem if you are loading single shot.
Dropping your powder very slowly or through a long drop tube will allow it to settle more in the case and you are less likely to need to compress the load.
I shoot benchrest and we use loads so hot that if we drop them into the case quickly they fill it up and occasionally overflow. Dropping the powder slowly solves this problem.
Yes, I am familiar with drop tubes to load black powder. No surprise it is done with smokeless too.