That's a good point. In a high school, the team members are usually adults the student has had interactions with before, such as the case manager, one general ed teacher representative, the guidance counselor, and any direct service providers or evaluators. In an elementary school, they may not have met some of the team members, or may have encountered them only at a distance.
Not every meeting has multiple (or any) administrators involved in it, either, though complex or contentious cases are more likely to.
The bottom line is, you know your child best. If s/he has something specific to say, or wants to be present, then I would seriously consider it. You may also have them come in for just the end of the meeting (or some other specified time), when the part of the discussion of particular interest is occurring.
