This does not necessarily applies to all. My father died last year. We were never close. I don’t even think we’ve ever talked besides absolutely necessity.
Someone well-meaning recommends someone to cherish their parent(s) and maintain contact with them, and gets checked by people telling them that not all parent-child relationships and interactions are pleasant or desired.
Are many people here estranged from their parents?
I too have seen my biological father barely 10 times in my entire life, but I have had other father figures in my life, uncles and aunts and other adults that raised me and guided me, and regrettably passed away too soon because I could pay them back, or even show them my appreciation enough.
There are still people from my childhood who still help me and whom I wish I could get along with, but there is also a lot of friction between us and I regret that, because they are at the end of their lifespans and I would like to part on a better note if possible.
People only live once and there is never anyone else exactly like someone. Even if you despise your close relations on a personal level, in the interest of "science" I think you could still try to gain their insights and record their experiences, document their history, before they cease to exist. Especially if you are the best or only person in the position to do that.