Yes, mowsehowse, I agree with you. But will it tell their descendants what their life was like, the clothes they wore, the jobs they had to do to survive, where they met their future spouses? Will it show their struggles with loss of jobs because of injury, sickness, or even sheer bad luck?
I struggled when I first started out on my journey...I had the photos but very, very few of them were ascribed to a certain person or place. A couple had names on them that I did not recognise and only found them years later when researching whole families (rather than just the direct ancestor). In that respect, I am gradually completing the task and annotating the photos with names, dates and occasion. I still have a few to go but, having been bolstered by another very recent discovery, I am confident that these last few will reveal their secrets to me.
I have received facsimiles of handwritten letters and I make it a priority that I 'decipher' them and type them up so that others can read them. And they reveal some very interesting and sad information. I wouldn't get that from DNA.
Sadly, I think 'Reine-Marie' was right - and it is a shame in my estimation.