At the unit, district and council level, there are metrics tied to the level of service activities provided by both youth and adults.
In fairness, the major application I can see for adult camping logs include evaluating whether or not the adults qualify for OA nomination (camping nights). Having enough adult leadership available for OA is often a struggle, particularly now that we are serving female youth, and need at least one adult female leader 21+ at every OA event, including for example, monthly chapter meetings. Some chapters have had female scoutmasters/ASMs as arrowmen for a while. Others are female-leader poor, and will have trouble serving the female youth. Easing the burden on units to determine whether or not a given leader qualifies is of higher importance, to me at least, than supporting every possible award.
I fully back the Hornaday Award, and wish earning it was more common. At the same time, only a vanishingly small fraction of the membership pursues/earns the Hornaday Award, in comparison with the number of youth and adults who are inducted into the OA.
I’m not saying that means my prioritization of the adult logs should be the BSA’s priorities. It’s just an explanation of why I think it should be higher up their list than it appears to be.