Djosers pyramid has an inner chamber that is suported by massive cedar timbers hauled from Lebenon.....and we have the Epic of Gilgamesh which details the triumph of Gilgamesh over humbiwaba the forest guardian, and harvesting and transport of cedars from Lebenon, we also have the commercial records of the mesopotamians trading activities over vast distances and time periods, and so it is zero surprise to find that "the black haired people" also left there genetic's with the rest of the cultural, linguistic, and mythical baggage that we are consiously or un consiously hauling around, still.

The tomb and temple complexes aren't built to accommodate demand. They're built at the size the king wants them to be, and used for official ceremonies.

You might notice that 2500 years ago is a lot less than 5000 years ago. 5000 years ago, there were no guides to the pyramids. There was no tourism. There wasn't really writing, either.

Today tourism makes up a little more than 10% of the economy of Egypt. 2500 years ago, it would have been around 0%, for the simple reason that almost nobody could afford to be a tourist. The big businesses were grain and gold. 5000 years ago, it was actually 0%. That's when the desertification of the Sahara began and the people who had lived there came to Egypt and inserted themselves at the top of society.

Not OP but.. The ptolemaic Pharaohs (Cleopatra..) and after are not related to the dynastic cultures which made the pyramids. They were greeks. Subsequent occupation by post Roman cultures including the Byzantine, and Islamic Arabic tribes, and the Ottomans, means the culture and genetics of modern Egypt have little to do with pyramids and pre-roman era mummies and culture/religion/beliefs.

Waves of occupation over 2000 years eroded any cultural link.

What I read suggests the Berbers have some historical relationship and the Bedouin less. Nasser was an arabist, as were the young egypt political movement of the 19th century.

It's like asking why modern British people aren't strongly identifying with pictish culture or beaker people.

The Egyptian archaeologists assert nationalism and cultural goals and have to deal with Islamic fundamentalists who push back on pre Islamic religious artefacts. Saudi archaeologists have similar pressures.

Modern Egyptians are primarily Arab. If anyone is a descendant of the Ancient Egyptians, it’s the Coptic Christians, who still use a descendant of the Ancient Egyptian language as a liturgical language and mostly don’t have any Arabic ancestry (since the child of an Arab Muslim and a Copt would almost always be considered an Arab Muslim).

Egypt is an Arab country. They're literally called the Arab Republic of Egypt. Before that the United Arab Republic. Official language Arabic.

Arabs came from Arabia, not Egypt.

Copts are a bit closer to ancient Egypt (their language especially) but their religion is Orthodox Christianity which influences their culture, which came out of the Greek/Roman culture of Ptolemaic-Roman Egypt.