I'd say you, 1337INT13H, don't understand why we need one.

It's about using data that comes from other sd-based devices, not about the storage capacity as such. I have no use for 64GB mass storage. I do need a way to get all my photos from my digital camera to the phone so that i can upload and share them. Or I want the videos from my friends phone on mine. Plus, of course, I want to boot MeeGo on my phone. How do you do this without an SD card? Share a video via bluetooth? Erase your N9 to try a new operating system?