Why would performance anxiety be disqualifying for knowledge workers?

Everything involves performing and actually proving what you know. If this is such an issue, then its something you need to fix. I have never actually met anyone who has this “perfomance anxiety” where they are so brilliant but do poorly on tests because of it. I think its a myth to attack rigor of academics. For knowledge workers everntually you have to go into court, or perform surgery, or do the taxes or give the presentation, or have the high pressure meeting. If anxiety is truly debilitating to the person all of these situations theyll be doomed so filter them out.