Yes, well some risks will lose you your entire flock. I have a friend who is a long time breeder (20 years plus) of my breed of choice, and he lost EVERYTHING recently, even though he quarantined...at some point his biosecurity measures weren't enough...he even had to cull an 8 year old hen that he went out in a hurricane to rescue...broke his heart...and mine...our country will likely never see the likes of those birds again....
Point I'm trying to make is, keep long term consequences in the front of your mind, rather than "what you want right now"...it could literally mean the difference between life and death for your entire flock.
Thank you! Around here we have a fair number of discussions about several of your points. Doing the absolute best I can for what is already here is very important to me. The birds can't feed, water, or protect themselves. I feel I made an agreement with them that I would take care of that stuff for them if they will be their adorable selves and maybe lay some eggs.
We did adopt 5 older birds before I understood about the risks and put my foot down. I'm relieved we haven't had any negative consequences. But it is enough. There are 100 other birds here to consider.