Do other National teams have the same lack of consistency in their lineups?
Yes its part of the game. FIFA windows, except in the summer, always occur during most of the world's domestic leagues. So the club team and national team managers typically have to weigh a number of factors in determining if a given player should go play in the national team's matches. Now the "requirement" is that clubs must release players called in to national team duty. But there still is usually some kind of discussion.
1. Health of the player.
2. Importance of the match.
3. Travel time and distances.
4. National teams plans for the matches - are they going to use him in both, one, or not planning on playing him in either match.
So lets take Christian Pulisic as a good example here. In his last league match for Chelsea he scored a goal and his follow through carried him into the goal post. He clearly got his hip dinged pretty good and had to be subbed off a minute later. Now he is still in training and could be available. But:
1. The US matches in this Nations League are fairly meaningless for the US. We have already made the hexagonal for 2022 WC qualifying.
2. He is dinged up.
3. It would have required cross Atlantic travel.
So the smart thing to do in this instance was to just let him stay in England and work on his injury recovery. Now had this been a WC qualifying match then perhaps he would have been called in anyway.
So the result of these kinds of discussions lead to some inconsistency to national team lineups. And what is even more interesting is that many times a player plays a different position for his national team than he does for his club team. And a different formation and tactical approach. Its why national teams can sometimes look a bit out of synch....I have written about this before.
Now what this boils down to for the USMNT is that we are not a deep team. So when a Pulisic is out the next guy up is not as good, and in his case, probably not near as good. Look at last night. We actually looked pretty decent. Now put Pulisic and Adams out there and we are just a better team.