Yes, but I think my later comments were deleted (we know why). In that I point out that I can see why it's done the way it is and when viewed in a certain light it's not that big a deal.
Basically, just to reiterate myself, what they're doing is expanding the phone's filesystem onto the SD card which gives the OS more space to expand. Why they chose to do this, I do not know but if I were to guess it's because of the ease by which you can now integrate that storage. Basically, doing a RAID0 array (or close enough as makes no difference). Which also explains why you can't remove the SD card once it's put in.
Now, nothing on a phone is the only copy. Smartphones backup your content to your computer anyway, at least, that content that wasn't on your computer to begin with (movies, music, photos, ect.) so there's no worry of a single-copy of anything.
Then you see they're looking at the SD card not as a way to have removable media on the phone but as a way to easily expand the phone's total capacity after purchase. Now instead of buying an entirely new phone just because you want more space you can simply buy a new SD card, which can be pretty massive in size.
In some ways that actually makes more sense to me and I could see why you would choose to do that. I can even see why you'd make it hard to format the card (anyone who's done tech support as a job can understand why you'd make anything you don't want people doing hard). Would I have done things that way? Probably not. But I can understand the logic.
Also, you're mixing terms. Open standard refers to anything anyone can implement. Flash is an open standard. RAID is an open standard. H.264 is an open standard. Proprietary means no one but the company who created it can use it.
Also, as another side note, that's exactly what happened with Betamax so there's no need for a Microsoft with VHS comparison. It's too bad, really. Betamax cassettes were smaller and higher quality.