Yes, chapters should document their history. Some are doing this quite well.
Yes, those of us with parents and grandparents in BGLOs should get whatever information we can from them.
I can say that I enjoy seeing my family members' BGLO photos from the 1950s and hearing their pledge and campus life stories. Getting more details than that is difficult.
Apparently it's difficult for the chapters too since a lot of old chapters don't have the lineage and other info for their earliest lines. Part of that has to do with record keeping and the fact that many members from that long ago don't go back to the university and/or their home chapter.