I believe what Clark-Conure meant is that getting a second parrot (or third, etc) should be done becsue you want the additional parrot, and not to be a ;friend; or flock mate for an existing one. Adding to your flock can have several different outcomes, and not always the one expected or desired. Sometimes they hate each other, sometimes they become such good biddies that you are now excluded. And every variation on that theme in between those extremes. Its impossible to predict what the outcome will be and you have to be prepared to accept whatever that is.
Not to mention that adding a second parrot means 2X the mess, expense, noise and you most likely have to split your attention time between them.
One of the reason parrots make such good companion animals is that flock instinct, but WE become the flock to them.