How do you square your position with the evidence of the devolution of Aegean pottery at the end of the Bronze Age, specifically the disappearance of the fine and artistic Late Helladic IIIb/c examples and the widespread appearance of the relatively cheap and less artistic (minimal craftsmanship involved) Protogeometric style, without accepting a concurrent widespread economic and cultural upheaval?
The dating of the pottery styles is itself dependent on the pseudochronology.