Yah I’ve read probably a hundred articles on sleep recommendations and basically all of them say the same thing. Not trying to say that 6 hours is a good target. However, I do think that people are different so you can’t make a blanket statement for everyone. Personally, I just have a hard time sleeping more than 6 hours. Even if I go to bed early, non-stressed, not drinking, without anything I need to wake up for, it is often harder to sleep more than 6. 7 at most. Based upon these experiences, I often go to bed later now rather than wake up early morning and get frustrated because I can’t fall back asleep.
Certainly, people should sleep as much as their bodies will allow them to.