I think this is a good thread, very thought provoking. There are as many answers as there are chicken keepers, and none of them wrong, IMO. I can see why people buy chicks from feed stores, it's quick and easy and you can point out the ones you want. Tiny chicks are cute, and if handled regularly, seem to be friendlier, and is just plain fun. (as long as all goes well) I also see why ordering from a hatchery might be a way to go, you can get rarer breeds, large numbers, and you can order from NPIP hatcheries to protect from importing disease.
I also think it would be fun and interesting to let a hen raise a clutch in front of my eyes. It makes sense that those chicks would be healthy and better suited to the particular environment.
None of those options work for me, however. I can't have roosters here, and I won't cull, (knowing myself here, not judging), and re-homing is very hard, as nobody else around the burbs can have them either. So, I bought started pullets (2 EEs) from a poultry breeder, at a neutral location. I wanted to be sure I had girls. The birds were in a pen, I pointed to the ones I wanted, and they went in the pen and got them out. No one was allowed in the pen but the owners. I was happy with my girls, still am, 2 1/2 years later, but they are not very friendly and don't like handling. Then a friend called and asked me to take a hen that they found and nobody claimed. I said yes, but I am a big believer in quarantine! So I set up a cage in the garage for her, and took her to the vet, as she had multiple wounds on her back. While we were there, the vet ran a blood test for 5 diseases that could be communicable. All negative, and 4 weeks later, I started integration. She's my RIR, and I finally got the super friendly, follow me around, can pick up, kind of chicken that I envisioned. My $250 "free" hen. LOL.
I too, read these threads about multiple losses, and failure to quarantine, and wonder, like you do, if there is a better way. It makes me sad what people go through, and the birds, too. However, just like everything else with chickens, there is no one "correct" answer, it all depends on what people want and expect out of chickens. For every disaster, there are probably way more successes, that we just don't here about on here, because there was no cry for help, or support.