I see. Still, other phones can't do some things a BlackBerry can do. I hesitate to offer any as I'm likely to get shouted down as pale analogs of whatever I suggest will be offered as evidence against the point.
Take MDM, for example. Just about every smartphone features it, but none come close to the level of control or number of features offered by RIM. iMessage was touted as a BBM killer even though it was laughably incomplete in comparison. I've yet to see true push email on anything other than a BB (SMS trigged pull, delayed response, idle, etc. aren't push!) but half-assed solutions on other platforms are billed as "push" and users believe it.
I've even seen people compare the ability of their phone to act as a wifi hotspot to features like bridge. Really. Another user thought that Balance and the ability to add a second user account were completely identical!
I could point to older features that never found their way to iOS and Android like AutoText, but that's not very exciting. The point, of course, is that the competition never really matched BB on features. Features, that is, that a lot of users simply don't want to live without. There are unique BB features that you won't find on alternative platforms. BB10 makes this more apparent, of course, but it's as true today as it was in 2005.