hi guys, got a favor to ask. can somebody shed a light on this kitkat issue?

i didn't quite understand all of it, but what i did pick up (i think? do correct me if i'm wrong) is this.
once u upgrade to kitkat:
1. all apps data that was previously stored in SD card will be lost.
2. any new app downloaded, the data can't be stored in SD card.
3. and if u managed to get it stored in SD card, u cant copy/move to any other folders u wish.
4. if u delete an app that saves its data in the SD card, the data/content will gone as well.
5. only the 1st party apps (stock apps) can write to SD card, 3rd party apps can't. (e.g. in xperia devices, we have stock File Commander app which we can use to copy/move files to SD card; however the File Manager app downloaded from google play won't be able to copy/move files to SD card)
6. so this means.. we can only use SD card to store photos and media files
Article SOScan the sifus comment on this?
i'm using z1c and planning to upgrade it to kitkat... but now i'm not so sure anymore

i posted this on android general tered but nobody responded. hope u guys rajin enuff and cekidaut for me?