Google decided 2 years ago that removable storage media was "a security issue" and the OS has actively removed the ability of any maker to provide this option BY DESIGN. Nothing Android is going to have it going forward. Yeah it shits...
This isn't right. Google decided that the setup where every app can read and write to the whole SD card was a security nightmare, and tightened up security controls--apps can now only read and write to folders that they've created (or been given ownership of). So app A can't create (or delete) files in a folder owned by app B, and vice-versa. Those security changes can be turned off via a ROM tweak, but manufacturers are not allowed to do so out of the box--they can (and do) still support external SD cards with the new permissions model.
This definitely caused some problems with apps moving to Kit Kat, as they need to move to the new security model and apps that stored things in other locations often broke (leading some people early on to believe that saving to SD cards was forbidden in Kit Kat). Most of those have been fixed by now. And there are non-security benefits to the new model, too (e.g. when you delete an app, it can be fully removed along with all data, instead of leaving random files behind).
http://www.androidcentral.com/kitkat-sdcard-changes?nopaging=1 has some discussion.