I think your wrong really.
Look at aphex twin bangin things to bits at Bloc
OR acts such as Lusine or Arrovane, utterly danceable, totally experimental.
There are many more acts, Autechre don`t really count for the majority, and in fact your assumption that all IDM is broken super staggered beat stuff like autechre shows your own pidgeon holing of a genre that is VAST in scope, in comparison to techno.
Even dubstep has pushed things in terms of experimentalism more than techno in the last few years, with really unconventional sounds and very very loose beat structure.
I`ve been bying a lot of minimal house recently, which is also showing more innovation and experimentation than techno currently.
I can`t really pick that much techno out, outside of minimal, that has been experimental or innovative for the last few years, bar a few exceptions.
Care to name a good majority of techno that is vaguely experimental and deviates from the techno norm that has been made in the last 4 years?