I don't speak about this very short fade made to not 'clicking', I speak from a full possibility to make a long or short crossfade.
Cause we need for example to make smooth crossfades (long or short) between synth pads or many material. Think about it : Protools, DP, Logic....
I think it's very usefull! In the arrange mode, on the timeline!
To make crossfades of durations varied between the clips, is a very significant functionality...
You made deep freeze or video import, for Live 6? OK! But think about C-R-O-S-S-F-A-D-E-S !