I agree that having sub-specialty sign out is easier for learning, particularly for junior residents. However, if you work in community private practice, you'll likely be dealing with a grab bag each day (with some areas like derm or bone marrows earmarked for the paths boarded in those areas). Honestly, the decision on whether or not to go sub-specialty is largely related to the volume, and the presence/absence of sub-specialty trained pathologists in the group.
Similarly, the decision to have a cycle also is likely related to volume and the size of the residency program. I have also noticed most programs do some sort of cycle--2 day or 3 day. What I don't like about that concept is attendings don't practice that way. My program doesn't cycle: I preview, sign out (routines & biopsies & immunos from yesterday), gross, and typically attend a didactic every day. Frozen section is a separate rotation, and you learn to write helpful intraoperative gross summaries for the resident who grosses the case. I think the advantage of this is you learn to be efficient with your time, pretty sure I see a higher volume of cases over the course of my training, and I think it averages out the types of cases and volume better over the course of a week. At my institution, Wednesdays are almost always light due to surgical didactics, and some types of surgeries are more common on certain days. The downside is I don't typically have a light afternoon spent reading (frankly, the way I learn best, it would not be time very well spent!).