I never use compressed charges. I have never encountered any need, neither for purposes of achieving a velocity target nor for achieving an accuracy target. In my experience, if you need to compress a powder, you're using the wrong powder. And it does seem to be the case that reloaders who don't want to spend any money on powder try to make one or two powders "do it all"...just dumb reloading IMO.
Another objection I have to compressing is that two of the determining powder characteristics that contribute to specific powder performance is the shape and size of the powder kernels. If you compress a charge, then by definition you are changing the shape and maybe the size of the powder kernels, and now you're in uncharted territory as to consistency of load performance.
But, just my .02.