I'll have to think about this one. On the one hand genetic defects are being eliminated or reduced. On the other hand you have something we haven't had before, three genetic biological contributors and the possibility of genetic manipulation.
I guess I would initially say, no -
the "good" in this instance doesn't seem to outweigh the potential for "bad". I really need to think through and consider all the possible ramifications this could bring about in our world. So I guess that's a firm maybe.
All that aside, the things scientists are attempting today are just amazing. Perhaps not always good amazing, but amazing nonetheless.
I have not yet given enough thought to the "morality' side of the equation.
At the moment, the reservations that I have are related to changes in the genome being passed down for many future generations.
Perhaps we don't understand all potential "unintended consequences".
I agree with your general observation. However, as we "fiddle" with DNA, is there possibility of unintended consequences (other than positive) for future progeny of those who may have had "adjusted" or transplanted mitochondrial DNA sequences?