Polymerase can only amplify the population of RNA molecules. So, the population of RNA molecules would become of a population consisting of most rapid molecules for replication and then further evolution will struggle. Thus, connection of CCSI with CMIO is essential process to escape from such a non-living state.
There are a number of interesting points raised along the way, such as the generally one-to-one correspondence between DNA gene -> mRNA transcript -> protein enzyme -> single reaction (although many enzymes are often involved in a single pathway which transforms/produces a single substrate/product).