Pet rabbits aren't wild rabbits though - it's like leaving a dog out wandering loose because wolves used to. A pet rabbit isn't meant to be a wild animal at all, we've domesticated them for years so they're not the same anymore.
Also, wild rabbits would have deep burrows to live in which means they're not exposed to harsh weather constantly. A hutch will be exposed to all sorts of weather. Even having an insulated shed, the difference in temperature, noise, etc from stepping in from the rain/wind is huge.
And one last point is that wild rabbits breed prolifically, so it doesn't matter to their species if they're not particularly hardy or longlived, they get sexually mature and have enough babies that the population thrives even if lots of them don't live very long
If you're posting this because of your other thread then I don't think you can compare bringing them in when it's a little bit cold or windy to keeping them in after major surgery!