Very well said TessieB!
Pet bird wing clipping is one of those potentially volatile topics, as is discussing diet and pellets, and a couple other topics I'll usually stay out of.
I did want to chime in here because I have a very valid reason for clipping. Where I live at the moment, our front door is right there in the middle of the living room which is the only place the cages fit. If you saw the layout of this place you'd agree! With cage doors open the majority of the time we're home, and two people potentially going in and out the door, it just wouldn't be safe 100% of the time.
In Robin's case, I bought him at a bird store around 20 years ago clipped, and in fact he'd probably never even fledged. In the past a couple times when he did grow out, he had no idea how to fly AT ALL, and was actually a danger to himself. It's all he knows, so he's a happy (and safe) bird
The budgies ARE flighted, but they're in the back room, and only allowed in the living room (by the door) at certain times, when we're watching them.
While I DO think it's 'ideal' to keep a bird flighted, the two main circumstances I can think of where I think clipping is 'better' is when there is a great chance of escape out the door and no way to remedy it, and if a bird should get hormonal or otherwise aggressive and dangerous, and would need to be grounded for a time during training, or til hormones pass.
On a separate note, one thing that does concern me, is that within the year we will be having to move in with my elderly father to help him in his home. He owns a crazy Jack Russell terrier who is extremely blood thirsty for small animals

... The dog is always partitioned off, but at times she gets away and runs through the off limits areas of the house until we can chase her out. The birds will probably have to stay in certain rooms only except under strict supervision unfortunately.