no it didn't make sense, what has believing in genetics got to do with anything,
as for the first part about 18/6 and this is what the plants are wanting,
18/6 or whatever count is a human measurement, time is our measurement, not the plants, they don't have a linear life they have live by a cycle, they don't know what they want because they don't have a brain, they just adapt and make do with whatever the situation allows for.
The other thing is that most sativa strains come from regions closer to the tropics, where the light cycle is 12 hours of light every day all year, these plants never get 18/6 and get 12/12 from seed, so does this mean they only want 12/12 from seed because if so then anyone who grows a tropical sativa is growing it wrong according to you