A lot of these teams they face, have had the same roster for 10-12 years straight with a few younger elite players joining. The chemsitry and knowledge of how to play together is ingrained and innate.
This US team had KD and then basically a bunch of first timers and fill ins. Many of the best vet and in their prime players werent a part of the team(Bron, Stephen, Kyrie, AD, Klay, Kawhi, Butler, Beal, PG13, CP3)
Of course it was going to take time and look sloppy. And under the microscope of “if you lose any games at all, eveybody is ready to shit all over you and say the US is falling off or doesn’t care.”
So much elite talent coming up from all over the world now but the reality is, if you gave every country a year off from all the pro leagues to train and bond exclusively for the olympics, the US could field two teams that would beat any other country and win gold.