Understand that the inside of pyramids were supposed to be sealed up for eternity, not visited by people. Visitors would instead go to the mortuary temples in f

Understand that the inside of pyramids were supposed to be sealed up for eternity, not visited by people. Visitors would instead go to the mortuary temples in front of the pyramids, which indeed had ornate interiors and plenty of hieroglyphs. With the fifth dynasty pyramid of Unas, parts of what was presumably a funeral liturgy began to be inscribed on the inside of tombs for the benefit of the dead. This idea that these early, looted (and thus, empty) pyramids aren't tombs because they don't have writings inside is as silly as objecting that modern yet-to-be-filled burial vaults aren't burial vaults because they don't contain excerpts from the funeral liturgy from the Book of Common prayer on the inside. The writings on the outside tell you exactly what they are.