Why is it concerning that Elon Musk took a prominent role during a presidential press conference?

Mara Gillespie argues that Musk's dominant role made the President appear weak on the world stage. She emphasizes that Americans should want their president to project strength, but when an unelected figure speaks on behalf of the president while he sits idly by, it undermines presidential authority. This dynamic is particularly troubling because Musk is not an elected official chosen by the people, yet he was running the show during an official presidential press conference. Gillespie believes this situation should concern citizens and raises worrying questions about long-term implications for presidential leadership.