DRAM less for mainstream is OK i agree... But, is the price ratio of the small sized Kioxia DRAM less is in it's favor, compared to full sized with DRAM from mainstream brand? I guess this is the real question...

placed one of their ssd in a laptop recently, showed up as a kingston.

Kioxia is what left from "Toshiba SSD and flash mem" after the WD vs SK Hynix, Kingston and Seagate "tiny shark war". So it's normal.