It's problematic because current business organisation fads seem to mean that anybody doing hands on work has to be "on a team".
Recognising the existence of one-person teams might help a bit.
It's entirely possible to be on the same team as someone and not need to know the details of what they are working on.
What do you mean by "details"? The level of detail is highly context dependent. I'd argue that if there isn't a level of detail that all members of the team agree they should be interested in, then either the team is not composed properly or there is a misconception about the level of detail that is appropriate.