There is no harm, as I've tried the S1 and it produces special plants. Unbelievable scents. I'm just trying to understand why it's reportedly so stable.
As far as specific seed vendors go, there's more than one issue. Some, like Pacific Seed Company, ILGM and at least one or two other well-known sites, are hack pollen chuckers.
Issues also come up when we growers pop one or two seeds of a cross that has many phenos. I can speak about two different breeders regarding two different strains. MANY crosses out there are poly hybrids.
Dynasty Genetics Pineapple Fields has 4 phenos that the breeder talks about, but there are also freaky phenos that he doesn't mention. I grew out a pack and had 6 girls. ONE was fantastic, the rest were either not for me, but good, or total shit -- misshapen, wispy buds, buds that were all tails, low potency, etc. If I cracked one seed and didn't hit the jackpot, I would not have been happy.
Irie Genetics Scarlet Begonias has at least 4 phenos. All are good and what you like would depend on your personal tastes, but the fact is that out of 5 girls, I thought one was great, the others were potent but not for me.
But sometimes, like my current grow, I have 2 plants each of 5 different strains/crosses. If any have a lot of phenos, what are the chances that I'll get one I like?