Having done a fair bit of family history I can only see the point in DNA analysis if there's a question which could only be resolved with it and I haven't come across one yet. There are some which can't be solved but DNA isn't going to help. That several times ggfather who I suspected of having done a runner really died aged 24, buried several parishes away near his parents, and with a different spelling of his name to the one recorded here (damn homonyms!) but found by conventional means - and it did lead me to discover who his parents were*. My ggggrandmother wasn't married and didn't name the father(s) of her children but there's nothing to be done about that. My paternal ggfather's brother can't be found after the 1851 census, probably emigrated but I really don't care. Etc
* There would have been some interesting genetics given suitable material there because there is a history of dyeing unusually young running through a good many generations although whatever gene might have been involved seems to have been lost