I'll spin this in a different direction... we have a harness for Ivory (bare eyed cockatoo adoptee). She is clipped and when she first came home she could barely break her fall from off the cage or sofa. But, our experience with the little guys was that even if you take all flight feathers, some can still fly like the dickens (we have a cockatiel that you would need to literally cut her wings off to make her stop flying!!). But, clipping her makes her tire quicker cause its more work to fly, so after a few rounds of the room (and mocking you while she does), she eventually lands and you can catch her. Anyway, I was not happy that Ivory could not get herself off the floor or break her fall, and I really felt it had more to do with her being cage bound for most of her 4 years before she came to us. So, I started her with wing exercises - on my arm or hand and moving my arm up and down, Ivory would flap to get her balance. Not even two months later, the girl can fly from wherever she is into another room to track you down when she's been left behind, and she is even able now to turn and maneuver.
So that brings me to a point we keep discussing, working with the harness to take her outside (granted its a cold November here in PA, so not happening anytime soon)... but is it just me, or do people who take their bird out on a harness worry about predators anyway??? I just keep remembering story I heard once locally of a bird owner who put a small cage on her porch and was outside enjoying the sun with her birds and a hawk came down and picked up the cage and off it went... We don't have many stray dogs / cats in our area, but there are larger birds.... and is the risk of disease from wild birds to our beloved fids?? I would love to take Ivory out on the harness and get her more exercise (she is a total lap bird, but thats the whole cocktoo thing), but I encourage her to chew and fly (I won't carry her from room to room, I actually will put her on top of her cage and make her follow me if she wants to come along).
We have both clipped and flighted birds in our home... so I guess I straddle the fence, I feel its more bird specific for us.... The little ones can be real turds, so when they forget their manners, usually get one or two flight feathers clipped, just enough to slow them down and allow to rework basics of behavior
For Ivory, right now as things stand, I don't think I'll clip her wings when they grow back in, but that could change as our situation changes.
Anyway, thoughts on safety or precautions of taking your bird out on a harness.... that is a way bigger quandary for me then clip or not!
And I am so sorry to hear the stories of the lessons learned and birds lost. That is a pain I hope to avoid, but know sometimes fate has a different plan or lesson for us...
Thanks
Jen