To me there are things that are universally held correct and the riders are supposed to know these things, and this is part of the test - ie, turns done on the inside lead, trot on the outside diagonal, show pace to a single fence with a long approach, make the inside turn when possible, canter-walk transition with no trot steps, etc.
The problem with some of the recent finals is there is so much about riding that is not always done one way or the other and the judges are not specifying a preference, but they have one and they’re penalizing riders who guess wrong even if their “wrong answer” is executed much better than the other riders’ “right answers.” If you want a change of lead to the counter canter, specify it. If you want a certain lead on a short related distance, specify it. It was both very slick of Ellie to hold the outside lead and perfectly executed; I cannot imagine the judges think it would have been a smoother round if she swapped there (same with Skylar a few weeks ago). It’s frustrating as a spectator to have to guess after the fact why the placings were the way they were; I cannot even imagine as a rider, parent or trainer. I think the riders in the top 25 were correctly there but they weren’t ranked correctly and the judging/place changes after that were absolutely bananas.