So a quick thought experiment to get us all on the same page.
Breeder A crosses a single purebred "Snowstorm" to a single purebred "Illshit" and gets an "F1 ShitStorm." He chooses his favorite two plants to make more seeds, and releases it in the F2 generation.
Breeder B crosses her purebred "Big Dog" with her purebred "Fat Cat" and with the same process of choosing one favorite male and one favorite female, releases "CatDog" in the F3 generation.
When Grower 1 crosses his single favorite female CatDog with his single favorite male ShitStorm...
And Grower 2 crosses his single favorite male CatDog with his single favorite female ShitStorm...
And on, ad infinitum.
Does F1 even apply?
To make it that much worse, in real life the original four varietals are most often polyhybrids too. What does the name even mean when every single seed produces a different end product?
How do we mitigate the damage to the genepool caused by excessive bad-breeding? Conversely, do you even consider this to be damaging to the Cannabis plant as a whole?
(Forgive me if this post isn't very clear, I haven't smoked in a few days. I had a specific point in mind when I started typing and my train of thought derailed a little bit. Lol.