To me, clipping is a personal decision.
This is my PERSONAL VIEW only.
There are times when it isn't optional. When you have a dangerous, untrained territorial bird, and those I short clip... these are the birds that would potentially inflict injury, and would not be willingly controlled.
(Sally started out short clipped. Had to be. She was attacking people with intent to maim!)
As she trained up, her wings were allowed to grow out, and she was kept semi-flighted. I worked with her for awhile in that condition, and got her to the point where she would fly across the room to me.
At THAT POINT she began free fly training, and gradually, she was allowed full flight privileges...
Maggie is also kept fully flighted.
Sweepea was for awhile, but we had a few incidents where she flew off on me, and I had to go find her, so we stopped the free flight stuff with her, and kept her semi-flighted.
Py was fully flighted, and free flown. He also got hit by a car and killed! SO, THERE'S THAT... Free flight experiment ended, for me, anyway.
EVERYONE ELSE I keep Semi-flighted. They can fly across the room. They can glide to the ground. They can get out of their own way, confidently, if need be.
If you clip them too short they can very easily be injured.
Flighted birds in the house can also very easily be injured. (Ceiling fans, windows, walls, kitchen stoves, sinks, etc.)
You don't ever clip them before they have fully fledged.
Other than that, it's a personal choice.
AND THIS IS THE LAST TIME I EVER POST ANYTHING ON A WING CLIPPING THREAD, THIS TOPIC HAS BEEN DONE TO DEATH, AND HAS GOTTEN STALE.