Most DNA strands are going to be too long to fit in the Ribosomes that produce proteins. Also RNA isn’t just used to transport the genetic code it also carries out the work of decoding the genetic code and chemically creating proteins.
If you wished to “simplify” the process you could use RNA to do everything. RNA can replicate, it can act as an emzine, can be structural and it can to all the transcription and synthesis.
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