Not just your opinion - it was my first flock, like most, I didn't know much about what I was doing - having read a few books, and not much else. Worse, it was near the start of the pandemic, and I live in the middle of nowhere - so I bought the birds I could, whatever birds were available, whenever I was in town. Often, they would sell out before I could complete the 40 minute drive in.Just my opinion, and it is worth every penny you are paying for it, but I think maybe getting the Cornish X to free range may come under the heading of trying to make them into something they are not. However some people do seem to be successful at it. Personally, I think if you want a chicken to free range you would be better off with another variety of meat chicken. For what is it worth, I raised mine in a 12' X 12' box stall that had excellent ventilation but was free of drafts. I bedded them on shavings and I added shavings as needed. Used a LOT of shavings. I cleaned the stall only after the chickens were gone. My chickens ate a lot, pooped even more, but grew very very fast. I kept mine longer than most people because I liked big eleven and twelve pound roasters, but that is me. Had one dress out at over 16 pounds but I don't suggest anyone do that. I cooked him like a turkey and he was the best turkey I ever ate. My chickens were plump, meaty, tender, and the best chicken I ever had. The way I raised them was probably not the most economical way to do it, but it was almost labor free. Chores took about ten minutes morning and night.
So yes, I tried to make them into something they weren't intended to be - and worse, because my only males were CX, I tried to restrict feed until they were old enough to "do the deed" until I could locate a replacement Roo.
Learned a lot, making mistakes of necessity. Which Is why I shared my experience above, so others need not repeat my mistakes unless they wish to.