GW wants to sell stuff, if you come at the start of 3rd edition and say "hey, BoC is going to be squatted some point between 2024 and 2027" you automatically stop to sell them.
They did the opposite, BoC was the most broken army for months and did the bare minimun to mantain them, with just a tome and a hero, no more units, no warbands, no underworlds band.
Now the stock is almost empty, anyone can come at the end of the edition saying "but I just started them", because is impossible and the next batch will come for sure with squared bases and old world boxes.