You have to bear in mind that CRISPR was a molecular monkey wrench that bacteria throw into the works of a phage (bacterial virus) - a relatively small and acce

You have to bear in mind that CRISPR was a molecular monkey wrench that bacteria throw into the works of a phage (bacterial virus) - a relatively small and accessible single string genome, with the purpose to quickly wreck it to save their tiny existence, whereas higher organisms have their genes organised in densely packed assemblies that are convoluted and hard to access with the needed precision. See https://en.wikipedia.org/wiki/Chromosome https://en.wikipedia.org/wiki/Chromosome