Wing cliping is up to you, your home, ect... some birds dont stay as tame if left to fly some do just fine and stay very tame. Keep in mind just cause you clip don't mean they cant fly away so you would still need a harness to go outside.
My Grey is 8 years old and wont have a thing to do with a harness so I am saving up for an adventure pack for my grey.
Topaz is my baby blue quaker and she is learning to wear a harness and I love the idea of taking her places when its not 100 degrees outside. lol