I agree... My instructors emphasized the importance of experience and practice..in a courtroom. They also talked about how intimidating a federal courtroom is in comparison to a state court.
Yes, and only the ignorant or arrogant overlook that advice.
Years ago we worked on a case with an attorney who’d been General Counsel for a few federal agencies and also counsel to a former POTUS. Lots of great government experience and prestige but none in the courtroom. The first time he stood up in a real courtroom (and not a federal courthouse) it looked like he was going to faint!