There is a lot going-on in this thread...Many different topics going-on that aren't necessarily connected...So it's important that you try to understand everything as separate topics and then make an informed-decision using all of the different information given, which has been great so-far...
First of all, I agree totally with SilverSage about not ever buying a baby parrot that was sold by their breeder at a very young age, unweaned and not having fledged, to a pet shop...No matter how much those employees at the pet shop care about their live animals, they are not a replacement in any way for an experienced parrot breeder hand-raising/hand-feeding their babies, and ensuring that their babies are slowly "Abundance-Weaned" over time, and who are moved into a "Weaning-Cage" at the correct age so that they can learn to perch, to play with toys, to eat solid food and drink water out of dishes/bowls properly, to climb, etc. Just taking unweaned baby parrots who are still on many feedings a day, who have not yet fledged, and who will no-doubt be "Force-Weaned" by the staff of the store (not purposely mind-you, at least not usually, but it just happens in that environment, as pet shops are not breeders for one, and secondly, they do want to sell the babies as quickly as possible)...And "Force-Weaning" any parrot is probably the most common cause of severe behavioral and neurological issues in young parrots...They must always wean in their own time, when they are ready to do so...And also, as SilverSage already mentioned, they will most-likely also clip their wings before they are fully-fledged, yet another way to really cause a young parrot a lot of problems...
We recently had a new member who really did her homework and prepared fully before actually bringing-home her very first bird, a young Cockatiel...But she immediately noticed that her new, young Cockatiel spent his time, every day, all day long, just sitting there doing nothing. Literally nothing. He had tons of toys and foraging activities, he had a cage with many perches, etc. And he just sat all day long, never perched, always on the floor or the back of the couch, and never once touched a toy...He wasn't sick, which was the first thought of the owner of-course...Nope, he just had no idea at all what a toy was, what a perch was, nor how to perch, or what he was supposed to do with a toy...And that's what happens if they are not properly raised and transitioned through different stages of the weaning/fledging process by an experienced breeder, but rather by pet shop employees who are well-meaning, but who cannot be expected to know what they're doing with young parrots...
Now as far as whether you should bring-home a young, baby bird from a breeder or you should adopt an adult bird from a Rescue who needs a home, that's a personal decision that you need to make on your own, after you take-in all of the information you can...But if your main concern is that an adult bird is not going to "bond" with you like a baby will, that's totally untrue....In-fact, there is absolutely no guarantee that a very young, baby parrot who has been hand-raised by a breeder and who allows you to touch them right away, hold them, who steps-up right away etc. will bond with you at all! Birds form bonds with the people they want to form bonds with, and I cannot tell you how many people I know who have gone out and spent a ton of money buying a just-weaned, hand-raised, baby parrot, that they are solely responsible for feeding, spending time with, taking care of in-general, and who their significant other/spouse or the rest of their family who they live with wanted nothing to do with and who had nothing to do with the bird, and where that baby bird formed an extremely close bond with the significant other, the spouse, a brother or sister, etc. that had nothing to do with bird's care and who didn't want the bird, and the poor person who actually wanted the bird and spend a fortune on the bird has been totally ignored by the bird, and in some cases the bird really hates that person...So don't for a second think that if you go out and buy a young, hand-raised baby bird that the bird is going to automatically bond with you, because that's not how birds work...They work the same way that people do, they like who they like, and dislike who they dislike. And if you go out and adopt an adult bird from a rescue, they have exactly the same likelihood of bonding closely with you that the young baby does...