I would say nothing offers the same freedom and ability that ableton does.
I¬ve been playing electronic music live (before live pa`s I was in industrial bands) for 15 or so years, never had I more control over what I do, and with such simplicity.
Hardware PA`s are mostly, though not always, fairly linear predictable affairs, though some do push the envelope and really work the gear well, it`s just so hard to implement with hardware. And with money for acts, flight luggage costs etc, room in the club, hardware is just unworkable.
Yes there are a lot of lazy PA`s that are just people pressing play and then dancing about, but this isn`t just a new phenomena limited to laptops.
Hardware PA`s have been the same or worse, with hidden DAT and CD players being used in hardware "PA`s" for years.
I think there is a higher percentage of live pa`s that are actually doing something than their is a percentage of DJ`s who are doing anything beyond the most basic mixing.
I`m currently developing a syllabus for my live PA classes that I will be teaching and it`s really making me notice just how much the potential for what you can do live has changed over the last 10 years.