Below will go more indepth on the reasons why not to clip birds wings.
Birds can be trained and and tamed without the loss of their beloved wings. If you choose to bring a bird into your house, you must adjust your life for the bird not the bird adjust for you. This means removing ceiling fans or leaving them off, monitoring open doors, training the bird what windows are and how to avoid.
A clipped bird is more prone to aggressive behavior than an unclipped as they have no way to escape the situation or human that is bothering them. So if you are trying to tame your birds leaving the wings is a great way to help with that as they won't feel trapped in the situation. It would be like choosing to take away the walking abilities from a human of course they are going to need you but they won't be happy about it.
Obesity, muscle loss and muscle atrophy
Are another huge potential problem. Birds need to fly to strengthen their chest muscles. If their flight is limited by clipping, their muscles won’t develop fully enough to enable adequate lift and speed. Young birds who are clipped never become good fliers even if their flight feathers are left intact in subsequent years. Even worse, if the feathers of some bird species are clipped before they learn to fly, they may never develop balance, agility, or takeoff, landing, and flight skills and may be psychologically crippled for life.
Feather plucking is very common in clipped birds as Frustrated by their inability to fly, clipped birds often develop psychological and behavioral problems, such as feather-plucking. Because clipping can cause irritation, birds will repeatedly pick at the feathers, which only causes more irritation and starts a vicious cycle.
If they are improperly clipped, birds may have problems regrowing their flight feathers normally. Both wings must have the same number of feathers clipped, and to the same length, for the bird to balance properly, maintain flight control, and prevent crashing and injury to the keel bone, beak, and wings.If the feathers are clipped too much, the bird will fall, possibly breaking his or her fragile bones.
It’s dangerous for someone who has not been properly trained to clip a bird’s flight feathers because it can be hard to tell whether a feather is a newly grown or still-growing “blood” feather. When cut, these sensitive blood feathers can bleed profusely and may cause birds to panic, flap their wings, and lose more blood. Breaking a blood feather is painful and distressing, and if the blood flow does not stop within 15 minutes, it will require an emergency trip to a qualified avian veterinarian.
Let birds be birds. Birds have wings and feathers so that they can fly. The only suitable home for a domestic bird is one in which this intelligent animal can live with wings and feathers intact and the freedom to fly.