Here's my take on it:
I don’t think there’s anything too worry about. I’ve always felt that hatcheries have their place, and make an important contribution in getting people started in chicken keeping. Folks that choose to delve deeper into breeding poultry soon learn just how important selection of breeding stock is no matter where their stock comes from. So yeah, purchasing chickens from a good hatchery can give a person a start, but they need to be prepared to do some serious selection if they want to make progress towards their goals.
Personally, I’ve never felt there was anything wrong with starting with hatchery birds if that was the best source of stock available. Not all breeds are easy to get ones hands on, some are next to possible. Besides, I don’t think hatchery birds are bad per say. If anything, they are strong, resourceful chickens bred for production first and foremost. Of course, not all hatcheries are created equal, nor are their birds. (But neither are breeders if we're being honest.) Besides, I would think most hatcheries are run by skilled professionals who know what they are doing, or employ those that do. Maintaining huge, diverse gene pools on such a large scale is no small feat, imo. (and truly how many backyard breeders can say the same? I know I cannot.) So assuming hatchery = bad breeding is not always the case.
In fact, in some cases I think people would be farther ahead getting chicks directly from a good hatchery rather than buying from someone basically selling the same thing privately. Now I'm not talking about a well-established breeder who has been working hard and making good progress with their flock for 10+ years. That's still the best way to get a good start in any breed or variety imo. But there are many private sellers who sell chicks and eggs from a trio or small group they’ve kept back from their own hatchery chicks purchased the previous year. In both these cases one would need to be prepared to do some heavy, heavy culling...but you would likely get a wider range of genetic material to play with from chicks straight from the hatchery, rather than from a trio that came from the same hatchery. Just my few cents on the matter, hope that makes sense...