Because cartridges are objectively better in every category that mattered to them.
Retro internet geeks have different priorities....
Don't agree at all. I used a DE for the first time at Age 54 and it was easily the closest and most comfortable shave I ever had. Cartridges made my face feel like raw hamburger meat. I think multiblade razors were created so that the razor companies could charge more. The canned goo and gel was just as bad.