I'm sitting next to my HD7, which replaced my HD2. Over the time that I owned the HD2, I never removed the 8Gb card once. Nope, not once. My HD7 has 16Gb.
I myself have, time after time, shown people how to change their camera app to save their pictures onto the SD card and applied fixes for dodgy SD cards that wouldn't play media that well.
I PREFER certified cards in WM7 as it reduces tech calls, problems etc etc and by changing the card, I invalidate my warranty and the card gets trashed, so be it.
Stop being dumb amd tech users, think of the average joe out there. DOes the iPhone have removable storage? No. Did WM6.5? yes. Which had more problems with memory? Ohh let me think about that.