Perhaps there is slightly slightly different ground energy state of the two different chiralities and Nature selected the slightly lower one. I have not seen evidence supporting this hypothesis.
A similar mystery is why DNA chose a base64 nucleic coding system for 21 amino acids and a few punctuations. Some of the codons are redundant and some unused. (There appears to be a fossil base16 coding system inside it.) And synthetic biologists have modified it into a working base216 system with additional nucleic acids and amino acids. Perhaps again there is some ground energy argument as to why this universal 3-billion year old coding system is as complex as it is and no more complex.
A similar mystery is why DNA chose a base64 nucleic coding system for 21 amino acids and a few punctuations. Some of the codons are redundant and some unused. (There appears to be a fossil base16 coding system inside it.) And synthetic biologists have modified it into a working base216 system with additional nucleic acids and amino acids. Perhaps again there is some ground energy argument as to why this universal 3-billion year old coding system is as complex as it is and no more complex.