Core and BH ships

[Lusitano]

Hey

So with the Core ID you can have BH ships at 100%, but the other way around no ... i understand the first part because i'm here since 4.85, so i know that the Core camed from the BH that went to the Omicrons and all that stuff, but why not the other way around, BH can't can't fly Core ships? But the most strange is that Interspace Commerce can fly both BH and Core ships!! Why this duality of criteria? It is something in the lore that i'm missing?

Thanks in advance