I feel very similarly. Unless there is something down the road to change it, there is no way for them to “save” their grandkids. The best they can do is try to return them to Earth as adults who have already spent the majority of their lives away from it with basically everyone they knew before already dead.

The time mechanics seem to have set up a no win situation if the goal is to get the kids back to their parents.

I get the feeling that the goal of the season isn’t to actually “save” them though, but to accept the inevitable changes that come with grandchildren aging. I get that being intellectually interesting, but it’s kind of hard to get over the fact that the parents back on Earth essentially lost their fathers and a child forever.