I wouldn't want to argue with the experts, but thinking back 60 years or so, the big Hunter and Lightning teams would, in the case of the former, operate up to 18 aircraft. This with a heavier, bigger and more robust performing machine. They would also split the full formation into smaller set teams with varying numbers, mostly to spread as far as possible on the annual "At Home" day when stations in double figures would be open. The Firebirds (Lightnings) flew a 10-ship display over Biggin Hill then split into 5-ship teams to cover two other events. This would surely increase the workload, different sequences with varying numbers requiring additional practice. Not to mention at least one pilot, in addition to the overall team leader, would also need to be team leader for a smaller formation. All aerobatic as well.
FB