...we don't actually know when the Pits were constructed relative to the construction of the pyramid, MT, or death of a king, it's simply part of the funerary hypothesis?
It may have been an ancient tradition unconnected with the death of a king but continued on in another context. Surely, no one at that time considered that a dead king required a boat to travel to the afterlife. And the king was traveling to the stars but the boats are called solar barques.
Maybe some connection with Re. But then the sequence is G1 (stellar) > Boat Pits (solar) > G2 (stellar)> Boat Pits (solar) > G3 (stellar) > No Boat Pits (??).
Separate the pyramids from the temples and the stellar/solar juxtaposition does not come into play. The conventional paradigm becomes questionable and brings into focus the possibility of two separate cultures on the plateau bridged by a period of destruction, either deliberate or natural.