While this is somewhat true, it becomes less relevant over time. As transistor size shrinks, leakage and static power loss becomes more and more of an issue.
AMULET was an attempt to make a commercial async chip and it flopped pretty early, one of the reasons being interfacing with anything else in the entire world kinda requires a clock.
http://www.ruf.rice.edu/~mobile/elec518/readings/DevicesAndC...
AMULET was an attempt to make a commercial async chip and it flopped pretty early, one of the reasons being interfacing with anything else in the entire world kinda requires a clock.
http://apt.cs.manchester.ac.uk/projects/processors/amulet/