basic parrot questions

Why would a software machine closely emulating CISC architecture be expected to execute as efficiently on RISC and CISC machines? Does it make any sense to create a low-level machine modeled on one-architecture instead of a high-level architecture which can flexibly optimize to either

What is wrong with GCC's register transfer language?

Is there some reason that a new pseudo-architecture has be invented and compiled to? Why can't we simply compile to GCC's RTL and allow gcc to compile to C? And then just write a RTL-JVM and RTL-CRL converter?