I think it’s pretty ridiculous. It takes away a great part of Superman’s mythology. As Grant Morrison said “For me, Superman has the same problems we do, but on a Paul Bunyan scale. If Superman walks the dog, he walks it around the asteroid belt because it can fly in space. When Superman’s relatives visit, they come from the 31st century and bring some hellish monster conqueror from the future. But it’s still a story about your relatives visiting.” I loved the idea that Superman had friends from the future. They idolize him but he learns from them as well.
They easily could have had Jon go off with the LoS but kept Superman’s history with them. It makes no sense to erase that part of it. Clark allowing Jon to hang out with some of his best friends makes a lot more sense than Supes letting Jon and Lois travel to parts unknown with a deranged Jor El.