Other practices are those of dispensaries in the legal states in the US. The flowers they sell are usually run through some kind of sieve to remove trichs and make wax/rosin/keef... The flowers themselves are weak. Lot of bait and switch happening.
Some cats are hip to push the pure flowers, but most are out to make money, not a happy customer... Wait, the customer is happy because they are getting a "good" smoke. From experience it is a hit and miss with the genetics. Sometimes an OGKush will taste and supply the OGkush effect, but often it is a true miss, not even close to what memory serves of the strain, sometimes purple, sometimes green. Just an example, but is that partly due to genetics as well? I think so and also that the Dispensaries are willing to take almost anything as long as it looks good regardless of genetics and strength, flavor etc...
My grow is for me, my family, friends and good people. I'd like to provide aforementioned group of a smoke they know is pure and clean, taken care of and not pushed around to make an almighty $.
Through some investigation, it should be possible to narrow down a good breeder to supply yourself with great genetics consistently, but the name of the game is MONEY, so it's really a chance you have to take. @Fuel is onto something with using same "Blood" lines to keep consistency. It a risk. Gotta pay to play.