yes you have it right... but prior to what year?? 2010 or was it later??? There were TWO mandatory step sequences in the LP. This is what I was referring to.
For the men, yes. For the women and pairs, up to 2010 the free skate required a spiral sequence. So the choreo sequence replaced the second leveled step sequence for men and the leveled spiral sequence for women and pairs.
Pairs has more different kinds of elements and in some cases splits the element types between short and long programs.
When the duration of the senior men's and pairs' free skates was reduced from 4:30 to 4:00 (+/- 10 s) a few years ago, the ISU did remove one jump pass from the men's FS, and one spin type from the pairs'.
At one point too the step sequences used to have mandatory features... for some that may mean, oh... mandatory, less creative... fine... BUT there was a focus on a pattern (straight line, circular, serpentine) or a feature like the one-foot sequence which was creating a very specific demand on skaters on those skills.
The step sequences still have mandatory features, although the specifics have changed over the years.
There are currently 4 features, so it is required to include all 4 in order to earn level 4. That has largely been true for most of the history of IJS, just the specific features have evolved over time.
The current features are:
1) Minimum variety (Level 1), simple variety (Level 2), variety (Level 3), complexity (Level 4) of difficult turns and steps throughout (compulsory)
2) Rotations in either direction (left and right) with full body rotation covering at least 1/3 of the pattern in total for each rotational direction
3) Use of body movements for at least 1/3 of the pattern
4) Two combinations of 3 difficult turns on different feet executed with continuous flow within the sequence. Only one difficult turn may be repeated in the two combinations. Only the first combination attempted on each foot can be counted.
I actually liked it when steps sequences had lots of specific scoring expectations and rules. As a spectator it made me feel "in the know" when I could tell the difference (with the help of Dick Button) betqween circular and serpentine, or when the skater was deliberately making a show of turning in both directions, or was hitting th bullet point for one-foot skating.
You can still look for most of the current features and feel "in the know" when you recognize them.
It's easy to see how much a skater rotates clockwise and counterclockwise during the step sequence, same as you mention above.
It's also pretty easy to see whether the skater is using body movements, although you'd need some more information to consistently agree with the tech panel on what counts as body movements for this feature.
You should also be able to recognize when a skater performs three difficult turns in a row on one foot. If you like, you can make a point of keeping track whether they do this once on each foot during the sequence.
Keeping track of which difficult turns the skater executed during these one-foot "clusters" to earn feature #4, or in the step sequence as a whole for feature #1, is more difficult.
Twizzles and loops are pretty easy to recognize. Rockers, counters, and brackets might all look pretty similar. If you can recognize that it was a one-foot turn from forward to backward or backward to forward that didn't just follow the curve of travel, you can recognize it as a "difficult" turn even if you can't name which one it was especially in real time.
And feature #1 has always been required across the history of IJS, although the specific definitions of kinds of variety required have evolved over the last 20 years. It should be no more or less difficult to keep track of now than it was then. (I.e., quite difficult for nonskaters or lower level skaters to keep track in real time, under today's rules and also the early IJS rules.)