When you're working digitally, pretty much the same limitations apply to the sound of the engineer's mastering workstation as to the final CD.
With vinyl, the limits aren't so obvious and there are certain things which will sound fine in the studio but not so great when transferred onto a vinyl master.
For example, really extreme stereo effects on bass sounds and kick drums don't tend to cut very well.
That means that
there may be compromises which will be needed when mastering for vinyl and that's why you need to find an experienced engineer and to be there while they're working.