Well if you don't understand you missed the way it all went down.
The short story is this.
Google took it out. If you had an older phone that got upgraded to ics, it was still there and supported. If you bought a new phone that had ics out of the box, you did not have that feature.
Again short story. Google made a decision and announcement that it would no longer support sdcards and in turn apps to sdcard.
If you do a search on the front page you can find the longer version.
Samsung, moto, htc, Sony, ZTE, any oem, has nothing to do with it. Samsung still supports the sdcard, but that's it
Sent from the nexus of the Android world, the SGS3.