People are good the way they are, yes. I must admit that if I could be changed by Technology, I could be a lot better, maybe even without being a cyborg. Some people just hate the way they are or who they are born as, and if Science can help them, I think that's only a good thing (unfortunately, it can't in most cases yet, including my case, even though there is complete Scientific evidence that my error is something I was born with).
I think giving people the ability to change things they are born with, which are problems for many, is also a bit controversial, because that would remove diversity and allow people to say "just go over and get your personality changed", especially for those who actually wanted to be the way they were born. That's not ok, and the best way would be to say people are born the way they're born, and that's ok and good and perfect and stuff, and then let them live their life as themself.
But we've changed nature since we first started having farms and stuff like that. It isn't natural for a billion straws of the same species to grow in perfect lines all alone in a trillion square meter field, with a mix of poo and pee being poured over it frequently from our beautiful machines, which are also so kind to harvest them once or a couple of times a year.
Our cities are no way near nature, with the roads and buildings. And we pollute alot, which I am against of course. But sometimes we can change nature without harming it, benefiting from it, that's my point.
And nature is also harsh. If someone were disabled for example, he/she would probably die in nature (depending on how serious the disability is). Again, we've changed nature by giving people wheelchairs and stuff like that, which has saved their lives, and I guess we can all agree that that one was a great change to nature.