We are here to help don't worry! I apologize if I came off as anything but helpful. We want you to make a decision that is best for you, your family, and any future bird you bring into it. It's really awesome that you are researching and getting as much information as you can! There are a lot of members here with many different lifestyles for their feathered family. Some have birds that are literally never caged, there are a lot of users that work long hours and keep their bird cages while they are gone, and we all love our birds and give them the best life we can. I agree that the breeding industry is (for the most part...I know a lot of wonderful breeders and hand raisers who breed out of passion not for profit) can be really nasty. Have you looked into rescuing?
All parrots need interaction and attention no matter what their species or lifestyle. Wether that is a flock of wild parrots, an untamed breeding pair, a flock of aviary birds, or a single parrot interacting with their human family. A single parrot left in a cage will become aggressive, unhappy, and cage-bound. Youll likely have a plucking, screaming, and biting mess on your hands and that is exactly what it seems you're looking to avoid. There are many ways to teach a bird to be independent and nonaggressive but that will not happen by putting them alone outside. What exactly are you looking for in a bird? Like you said, you do have to decide between aviary birds or a pet. if you are looking for a pet, they need to be apart of your "flock" in order to thrive. The keys to halting obsessiveness/aggression is training, dedication, a good diet, and interaction. To avoid over bonding issues, introduce your bird to lots of different people and teach them to play on their own. Basically: yes caiques and all parrots (caiques especially) really really need that much attention.
Personally, my grey is very interactive and very much a part of my family. She doesn't have an aggressive bone in her body and that is because I have taught her different ways to communicate and I always listen to her and respect her body language. I set boundaries and she knows I will enforce them (she still tests them daily). Espresso goes with me to the store, hiking, bars, anywhere! But this is all because I put a whole lot of time and effort into her socialization. She is only caged for bedtime and if no one is home but, more often than not, she is out all day long.
Sorry this post is a whole lot of babbling!! You definitely seem to have a lot of heart and the right idea....just the wrong idea about how to go about it all. Which is why we are here!!!