I don’t know anything about age to butcher or anything but i can tell you this, your feelings aren’t silly. I love my chickens and i have never had the “their just chickens” attitude. Mine sit on the couch if they want, they come in the house if they want, they do what they want and i spend hours with them. They even remembered what door led to a room they used to go into after a year!
Anyway, my point is, you can choose to, or choose to not, have an emotional bond with an animal. Its up to how you interact with them each day. Try your best to not look at them as you would a dog, but also look at them as more then a chicken, a world of both.
I hope this atleast made a little sense.
I can’t show any chickens at a tabletop or showmanship place cause i feel bad leaving them there, (you leave them for multiple days usually) but when i was trying to show and i bought a new chicken, i had to look at them as ONLY a show chicken. Nothing more. A reasonable amount of bonding so they let me handle them but not enough to make me feel guilty.
For the most part, it worked. I still didn’t do it though because of AI.