Well, yeah. But seeing as your comment was about ‘paying respects’, I’d argue that the coffin burial is a lot better than ‘digging a pit and pushing them in’.
I was also upset, several months ago, when I tried burying my companion in a pit only to find it didn’t work. It has something to do, I think, with how the construction stuff works. It alters the tile, but does not affect items on that tile. That’s why the burial only works with the coffin item and only works when explicitly told to do so. That’s if I understand it right.