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[–] meowski ago 

The important distinction is it's not altering the genome. It's altering the gene product. Therefore the trait will not be permanent (unless the rna can be reverse transcribed back into the dna but under normal cirumstances it won't)

To have any meaningful effect on an organism it will require a constant supply of RNA editing machinery.

With CRISPR, you can edit zygotes or a few cells in a fertilized ova, which is a practical method of applying the trait to the entire germline of the organism.

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[–] Lucretius ago 

Not all CRISPR is the same… The germline editing you are talking about is CRISPR/Cas9. But the transient quality of the RNA editing that LEAPER has, and you correctly point out, was present in some of the CRISPR flavors before LEAPER… notably CRISPR/Cas13.