I have researched a lot about free flying, it is super hard core work in training your birds and you have to keep the bond with them regularly. You can't slack. Neither one of my birds are clipped, but my yellow nape amazon was never introduce to free flying and now no longer has the strength for long flight etc, like that. However she has a stupidly large amount of strength when it comes to climbing stuff. Mom takes good care of her. She's never shut away, she has the choice to go in her cage and out. We only ever purposefully put her in her cage if we have company coming over that has too many people or things we can't trust with her and them. Kookie is notoriously a one person bird, even if she decides she likes you and sits on you willingly she won't get off willingly and someone will get bit in the process. She is also shut away if we are doing a lot of cleaning around her cage, such as the hamster cages, because she won't leave me alone when I am doing it and will constantly try to bite me. She also has time outs, but that is usually brief and only if she has done something truly bad, like she is having the nesting cycle that she does during spring, or if she doing a really big molt... she can be a uber brat to extremes during those times. It is a huge difference from normal territorial Kookie, to the one who actively looks for trouble. (happened a lot this year due to strange weather in our area throwing her out of wack)
Lark my little Bourke's Parakeet, is mine, is strongly bonded to me, and loves me as much as any hand-tamed larger parrot can love someone. He is incredibly intelligent compared to what I was expecting, he has learned tons of new calls (his noise are whistles and trills) but he has learned all the small native birds in my area (song-birds) that come into my back yard. He has conversations with them but I am honestly not sure if they realize whose talking to them lol. He also knows how to wolf whistle and is learning some new stuff by himself that he is mutating to his own cool stuff. He also has learned when to ask for treats and loves them far more than any other parakeet I have had. He likes veggies and millet the most. But does like toast and his bird mash. He also loves his water bowl for soaking and is very particular about having a seperate water bowl for soaking and also drinking 24/7