Ableton Live opens up so many possibilities that most DJs just can't cope with it. As stated manymany times, it only removes the "challenge" of beatmatching, and you can even simulate that by changing the quantize settings and assigning a controller to the clip scrubbers.
Seriously, I just don't get this idea that Live does everything for you. You still need to have a good track selection, know how to transition the tracks well, how to EQ, etc..
If you're an acid fan, imagine having Bassline params mapped to a MIDI controller. You can have a virtual 303 wailing over 4 tracks all at once. There are no limits beyond imagination, while most vinyl jocks are limited to the house setup of 2 decks and a mixer.
But this is all tired by now. Some people just take longer to come around.