That in itself would still make a lot of sense to me though; as far as I know, property and power was mainly transfered through the lines of first born males (so a patriarchy, in the literal sense). If that, social status and so on hinges on who your father, grandfather etc. was, then I think it makes sense for geneology trees to be something important enough to write down, especially in literature that was partially written to capture/produce a peoples cultural identity (i.e. parts of the creation story where written while the jews where forcibly integrated into the babylonian empire, and struggling to keep their own cultural identity. That's another good "use case" for genealogy, I would say.)
That in itself would still make a lot of sense to me though; as far as I know, property and power was mainly transfered through the lines of first born males (so a patriarchy, in the literal sense). If that, social status and so on hinges on who your father, grandfather etc. was, then I think it makes sense for geneology trees to be something important enough to write down, especially in literature that was partially written to capture/produce a peoples cultural identity (i.e. parts of the creation story where written while the jews where forcibly integrated into the babylonian empire, and struggling to keep their own cultural identity. That's another good "use case" for genealogy, I would say.)