From release notes for FC5T3 (web)

[Paul Howarth]

Daniel B. Thurman wrote:
> Giving up, I tried yumex and it was nightmarish, highly unstable, and
> actually FROZE the OS!  THAT was included in the Extra's folder and
> I cannot for the LIFE of me understand my this is supported and not
> APT and Synaptics!
> 
> APT/Synaptic was a very good package manager and proved it's
> mettle but apparently the Fedora Team must not like the fact
> they did not want something developed by another distro so
> apparently they threw this out of the extras folder and destroyed
> any chance to recover from a black eye.

More likely apt and things based on it are not used in Fedora because 
apt does not support multilib and is hence incompatible with the x86_64 
Fedora distribution.

Paul.