Static dates for OPRs in the Navy has been a thing for a long time. While there are some differences in ranking, etc, the questions you raise are very much an issue when writing paper on folks. It created quite the challenge to give a solid dude good evals if his PCS timing was wonky. Things like moving PCS dates, sending a guy TDY, etc, were all utilized to try and help make the reports look as good (and as long) as possible.
Length of the report was also a huge deal. For example, a guy who had a 1 of 10 with 12 months on his report carried a helluva lot more weight at boards as a guy who was 1 of 10 with only 5 months. In other words, will a CRO report help/hurt/no difference on a guy, since he’ll still also have to do a report at the static date.
I suspect this will be an ongoing problem as we switch to static close outs.