Having handled over 50 day old bantams this year, I have to agree that a large percentage did take some time to tame and I doubt trying to free range them in a normal setting and not an enclosed run setup would have made that any better. They can be flighty and skittish, trusting you one minute and spooked the next, they’ll flock at your feet but bolt from a hand. With my oldest group being now 6+ months old, the last few weeks have been the best for handling, lap time, and simply being around them. And it took a lot of work. Almost all have finally come around, more or less.
And there has been a big difference in the breeds, some being much, much easier to work with from the start. From my own expertise most to least ‘pet like’ were: Japanese, Cochin, Sumatra, Old English, Easter Egger, d’Uccle, Silkie, Sebright. If you want to be tripping over birds and constantly begged for treats, those first 3 are nearly puppies most days.