What is lost upon root and rom install?

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http://forum.xda-developers.com – Ive been searching these forums for about a month about the s4 which I now own. I used to have a samsung infuse and was very active on the xda infuse forums. When rooting that phone infuse users lost a lot of features like mhl hdmi, hi res cam etc. With rooting the s4 what is lost? From what I can find it seems like only the air gesture features are lost. What else is lost and is it that way on all the roms. I want to root this device but not if I lose things like bluetooth or cam. I maybe can deal with no air gesture things. Thanks in advance. Sorry if this is answered I have tried to find a (HowTos)