The interior of the pyramid is too industrial looking. No art decorations like the burial sites in the Valley of the Kings.
Industrial may be correct according to one engineer - strange as it seems, everything points to some sort of power generator - one which suffered a catastrophic failure. Chris Dunn’s book (Giza Power Plant - even if you disagree) has some very interesting observations about the interior structure and crystalline natures of the stones used, and how those properties could have been used to generate some sort of power - the exact nature and use of which seems elusive.
There is another point - the pyramid of Menkaure had a bio-thermoluminescence test run on it before such tests were forbidden. The age came back at around 3500 BC which is about a thousand years too late. According to traditional archeology - the Great Pyramid was build before Menkaure’s.
The more interesting point is that the entire complex was built as one geometrical structure ... many of the pieces - the stelae (many reported to be capped with gold) were removed during the 18th and 19th centuries - others were removed earlier by the Romans. What the original complex looked like and was designed to do, is just speculation.
Rest assured the complex is far too intricate and complex to be just tombs. For instance: why is the Great Pyramid 8 sided?
There is every indication that beneath several of the nearby Temples, there may have been large very heavy objects lowered in to hollow spaces - these could be the actual tombs of the Pharaohs who commissioned them or more likely wished to be associated with the complex; (see Robert Temple’s “Egyptian Dawn”).