Small errors add up quickly. The new routines were composed to be more “dancie” than robotic, but mark my words they will soon start looking very sharp and robotic, they always do as time goes on.
Basically, the movements should flow seamlessly one into the other. There are deductions for toes, knees, hips, shoulders, head, focus, rhythm, pausing, bent elbows, height, distance, split angles, hold times, balance, shapes, landings, dynamics, artistry, presentation, position of feet, extension, angles, control, and probably a few others I didn’t mention. (Contrary to popular belief, hand position during dance does not get judged). Judges are required to know these things like the back of their hands. We spend the time between May and September attending clinics, online classes, going into gyms, studying the codes, practice judging, and testing, and we also review materials and text each week before a meet. We learn the compulsory routines (last year we had a clinic and we got up and performed all the dance throughs for levels 1-5 as we learned) so that when we see them, we know exactly how they should look. We learn shorthand and learn to write fast (hopefully without having to look down).
Yes, there is some subjectivity—my pet peeves are not pointed toes and uneven splits—but overall there is a standard that should be across the board with just slight fluctuations for subjectivity. I don’t know if any of this helps, but I hope it shed some light on compulsory judging.