Birds are often compared to toddlers. Toddlers are into everything and are put into play pens to keep them out of trouble. I see no difference.
The comparison may be apt, but it's not very flattering. A parent who keeps their toddler in a playpen all or most of the time... well they're not winning any parent of the year awards, that's for sure.
Clipping doesn't do away with the need to bird proof and supervise. It may reduce some risks, but it increases others. I would be very wary of keeping a clipped bird in the same house with a dog or cat. They end up in the same room, dog/cat startles bird off its perch, now bird can't get away. Might get lucky and nothing happens, but a predator/prey accident can happen faster than a human can intervene.
Maybe it's just that I have a small and very active bird and I can't imagine how clipping him would actually keep him from getting into things. He'd just flutter/climb down and start merrily exploring anyway. I would still need to keep the toilet lid down, I would still need to keep him caged or in another room with door closed when one of us is cooking on the stove or opening the oven, I would still need to keep the windows and balcony door closed when he is out, I would still need to clean up after him, I would still need to shoo him away from things he shouldn't be getting into, I would still not have him out unsupervised.