Not talking about phones, SO-DIMM RAM slots in laptop took huge spaces. Manufacturers are racing to release the most "thinnest ultrabook" every now and then; slots are omitted to save spaces, simplify design, reduce weight and to milk customers by selling models with 4GB, 8GB, 16GB, etc with overpriced ram pricing. They gotta make some profit too. Also, SD card can never replace or substitute RAM's job. RAM isn't supposed to be "hot-swapped" anytime user want and it's not on OS level. I get the idea of such concept but right now, its technically impossible. But who knows? anything can happen in the future. You're missing the point. There are symbiosis between these chip makers and oem manufacturers for a long time which both took profit. Asus makes a motherboard for intel's processor. When intel refreshes their processor, Asus also releases new motherboard to support the new chipset and processor. Both get profit from their own product sales. Now, with modular components, why would I need to buy new motherboard if I can just upgrade the inside right? I just need to buy new processor, adds more ram, and more SSD capacity whenever I need. For us the customers it's cool and could save us money, but I doubt Asus would want that.