Hand-wavy arguments in science are useful tools, but more empirical evidence is needed. In order to make empirical arguments, a good deal more must be learned about cellular physiology. More genomes need to be sequenced and analyzed. One specific example where there is enough empirical data to propose and evolutionary pathway toward complexity is the Crebs cycle. That is only one example, however.
Much more work needs to be done.
The claim is often made that complexity requires specifying information. This seems reasonable. An arbitrary amount of information can be stored in a single real number, provided you have the proper key to decode and read that information. They allow for the existence of stable, complex molecules based upon carbon chains. For abiogenesis and macroevolution, we're just starting to learn.