Building an intergalactic hyperdrive requires far more advanced science than curing a physiological condition. There is no reason why a civilization capable of that wouldn't be able to cure a genetic disease. And you are wrong about being advanced in one area but not in others. For instance, creating the hydrogen bomb and sending man to the Moon required the development of computers, because the sheer amount of computations necessary for accomplishing that is not possible with a pocket calcluator. So here we have an example of an advancement in one area of technology advancing others. Look at us. We are far more advanced today in all areas of technology than we were a thousand years ago. Not in some, but in all. Technological development in different areas correlate. You will never see a species that is super-advanced in one area being completely primitive in another. As we advance, all of our technologies advance as well. Some might advance faster than others, but advacement in all areas of technology correlate.
2. A civilization can, in theory, build air planes and quite possible rockets that can leave the orbit of the civilization's home planet without going through an industrial revolution. Technological development would have been a lot slower, but it would have moved forwards.
3. The "Western" civilization today was created by European imperialists that forcibly modernised other civilizations in the world that were less advanced. That happened in the Americas, Africa and China and southern Asia. And Australia, too. The Greeks would not have done that. They would have made trade-partners across the seas (they already had such trading partners, but I'm talking globally here) and only influenced them in some ways as they would in turn have influenced them.
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