here is an example:
femized GHS super lemon haze (multiple cannabis cup winner) is in the flowering room, 5 weeks in to 12/12
she has developed 3 pollen sacs (male flowers) within the canopy so it is very hard to see them. she has just been hit with a high dose of pk 13/14 and the buds swell so quickly they almost envelope the pollen sacks. the pollen sacs release a small amount of pollen inside the buds of the plant, only pollinating a few flowers of the heavily budding lady.
6 weeks later the weed is dry and done curing so you break up the huge buds to put it into bags, strange a seed just dropped out of one of the buds, how the fuck did that happen?, you say.
somebody buys a bag of the potent shit you got and what do they find in it?, thats right a bag seed!.
they grow it out and it turns out to be a female which is the best plant they ever grew and they got it for free.
this is just an example of what has happened to many people in the community and it sort of contradicts what you are saying.
usually seeded weed is awful and if you do grow them out you don't know what you will get. in this case though it wasn't seeded because somebody left a male in with the females but because a plant pollinated itself.
Being a Cup winner, even multiple times, is not a guarantee of stable genetics. It only means that in a given year the strain was deemed, rightly or through lobbying or possibly other using other tactics, to be the best in it's category and or overall. When you factor in how feminized beans do have a higher rate of hermies than regular beans and the result is more hermies in 'gardens.' But that still does not prove that bagseed is on a regular basis equal to any professional grade genetics. If someone purchases low-grade herb and it is very seedy then it was likely grown seedy and it was not a case of a hermie so there should not be a high probability of a hermie trait being passed on. But it will still be low-grade genetics and make low-grade herb. If only a few seeds are found, in either low-grade or high-grade herb, it is likely due to a hermie and that means the hermie trait will be passed on and someone will have a high probability of hermies.
When I started growing no one even dreamed that one day professional genetics could be purchased. There was no option other than growing using seeds found in bags. But back then everything was a pure landrace strain and among the few people I knew who knew to separate males and females a hermie was a very infrequent thing to experience. Today it is different, the probability of experiencing a hermie from bagseed is much greater than it was a number of decades ago and it is not all that uncommon in some professional genetics, especially if using feminized beans.
In some strains the hermie trait was accidentally/unintentionally bred into them, sometimes by using crosses from the past whose genetics accidentally/unintentionally had the trait bred into them, and it was then passed on each time it or anything that came from it, was used in another cross.
That is the price now being paid due to the advent of modern era crosses.
Still, people need to keep in mind why any female plant can turn hermie. The singular purpose of every cannabis plant is the perpetuation of the species. Every single female plant 'wants' to produce seeds. That is their only reason to be. If they are not pollinated they go into sort of a last ditch panic mode and try to produce seeds. Their genetics allow them to do that under certain environmental conditions and if not pollinated they will make use of those conditions and turn and pollinate themselves and others around them. To plants, turning hermie is not the same sort of negative thing it is too us, it is strictly a matter of survival of the species, to non-pollinated plants it is a good thing, as in better than possibly dying out.
There are also environmental conditions that head to hermies that might be the cause of hermies in some growing situations, conditions/causes that many people do not know about and can be caused by people doing things we have all been told are good or should be done.
Research has shown that outdoor plants grown in windy conditions, where most wind comes from one general direction, have a unique pattern of hermie plants when not pollinated. The plants on the windward side of a group of plants will have a high percentage of female plants turning. The middle of the group of plants will have fewer females turn and the plants on the leeward side will have few to none. Something in the genetics 'tells' the plants receiving the most wind to turn and then the wind carries the pollen through the rest of the plants and the more protected plants do not need to turn to become pollinated.
That makes me wonder how much of a problem airflow can be for some plants/growers when the plants are not pollinated. What we see as being good airflow might in some cases be enough of an airflow for female plants to make use of their genetic survival mode techniques to then turn. When any possible unstable genetics are factored in the result could likely be a high rate of female plants turning.