As someone who is working on an asynchronous process myself, I should remind you that asynchronous is more a design level choice rather than a magic bullet that makes everything better.

In particular, in CPUs with a big centralized register file there can be significant overhead to having an asynchronous CPU.

There are certain architectural cases in which it can be a killer advantage or other cases in which it is pretty much the only way forward (e.g. in a 3D chip it can be quite difficult to distribute a high speed, high quality/low skew+jitter clock)