Genetics of Hazara clearly differentiates them from all other ethnic groups of afghanistan despite their heavy intermixing with other afghani ethnicities in afghanistan over the centuries, same is the case with most of the uzbeks and turkmens too. It is not as simple as many people like to believe, we are talking about a very large tribe of Ghilazis whose numbers are twice the total population of Hazaras in afghanistan, the genetics of such a huge huge tribe cannot just change to the genetics of another equal size tribe like durranis/abdalis due to intermixing, if it was the case then both of them should show at least high levels of east eurasian component contributed by the massive tribe of supposedly "turkic" origin from central asia but that is not the case which means that the mythological claim of turkic origin of ghilzai tribe is simply put a BS of history books . I have totally stopped taking the origins of the tribes based on history books seriously , we live in modern age we can ascertain the origin of each tribe and ethnic group quite easily by modern scientific genetic tests. I am a student of science so my belief is always in science rather than in history books because I understand "science" in its "real" form and know how it works.
If I remember correctly, Pashtuns did have a substantially big east Asian componen(around 4%-7% if my memory serves right). Science can't describe genetics clearly. The genetic results are very ambiguous. And you might be right about Ghilzais though. They're assumed to be turkic only because of their name's similarity with "Khilji". Khiljis are said to be named after a place called "Khalaj" and weren't pashtuns at all.
As for Hazaras. I don't believe intermixing is all that widespread. They're looked down upon by Tajiks and Pashtuns just as mussalis and kammis are looked down upon by Rajputs and Jatts in Punjab.