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This "slow and safe" is just another fallacy. Modern plant breeds, from foods to decorative flowers, are not made by decades of slow Mendel-like selection. They are produced by mutation breeding:
https://en.wikipedia.org/wiki/Mutation_breeding
Most cannabis varieties in sale today were also produced using radiation or chemical mutagenesis.
You can't imagine a more aggressive method of breeding than radiation or chemical mutagens, yet it's been around for almost a century now.