Feels a bit odd to leave the elves like this. I mean this is an Isekai fantasy setting, and our MC has already demonstrated extreme magical and healing abilities where he elevated the race of his Dragon companion, so why hasn't he considered some method to help the obviously unhealthy elves?
Sure, they may not be outwardly wounded, but he should certainly be aware that their ailment is mostly caused by genetic defects caused by their isolationism. Could he not simply attempt to heal them by focusing on genetic defects specifically? Since he more or less "remade" or altered his dragon friend, even if by accident, he should know that it's a real possibility, even more so if he should heal them while focusing on that outcome. Leaving many of them in their overtly twisted/broken forms, feels like he's not really trying, even more so considering the struggles of Brolite that he has seem himself.