As a retired history teacher, I have to add my two cents worth.
When I was teaching I sometimes took my classes to a local cemetary to plot a section of graves, with info about dates of biryh and death. We would then look at local documents (newspapers, etc) to note causes of death, epidemics that wiped out all the children in families, etc. The students came to view cemetaries as rich historical sources . . . the same as i do.
When I was in grad school a professor was doing research on cemetaries, noting that different thnic groups had significantly different cemetaries.
If cemetaries were only for the dead, there would be no use for tombstones. I personally like cemetary caches, because most of them enhance my knowledge of the history of the area.