Manufacturing DRAMless SSDs make a lot of sense for some companies. Intel, Toshiba, and SanDisk/Western Digital all lack the ability to build DRAM. Samsung, SK Hynix, and Micron are the only three fabs with both NAND and DRAM manufacturing. The reason why these companies build and sell SSDs is to move the components they manufacturer, and in this case, it's NAND and DRAM. Why is Micron/Crucial selling a DRAMless SSD?

I don't think Crucial had much of a choice in the matter. The BX series has always been an entry-level SSD with fewer features than the mainstream MX series. The MX500, for as good as it is, lost some long-standing features like hardware host power-loss protection (an array of capacitors). In addition, the MX500 entered the market with an aggressive price point that has only shrunk since the release.