not so unusual. I remember that I once used similar ones to adapt the old 72pin SIMMs from the 1. generation of Power Macs to the 2nd generation’s 168pin DIMM Slot
I like that design better. I have some "SIMMExpander" things, but the SIMM slots are perpendicular, making it difficult to use. So to be able to use them, they sold them right-facing, left-facing, short, and tall.