Nand flash package size
Well the obvious answer is people must still be buying them.  What is good for you might not be good for the next guy.  Some people don't want to mess with bgas in assembly.  Maybe they require 100% visual inspection of the joints.  Maybe the engineer does have the space and appreciates that he/she can solder it on or off themselves.

Not every project requires or even should use the highest density smallest parts available.