The StSq in COP has a base value dependent on levels (1-4). To achieve levels (ideally, 3 or 4), the skater has to do a variety of turns, in both directions. I'm not nearly pro enough to analyze step sequences, but practically every set of 6.0 steps would get low levels, because the skaters would often repeat turns/perform fast toe-work/aim for speed/quality over quantity, none of which get you levels (they potentially get you GOE, but that's not enough to make up for lost levels). Sometimes, steps under COP look kinda sluggish/not fitting the music/similar to everyone else's--and no wonder, since everyone's trying to cram in the exact same turns. Of course, some people still do nice steps under COP (and some people did not under 6.0).
At least, post-2010, the ISU introduced a choreographic sequence in the LP--basically, "do whatever you want, we just score you on GOE based on how well-done/exciting it was." That section could be used to incorporate something like the Tango and Flamenco steps.
Just as an example (with Plushy's 2013 Nationals LP, since we're on his thread), here's the
step sequence, and here's the
choreographic sequence.
Oops, rambled again. Not sure if you're interested, but I thought it would be nice to talk about something that's not just (un)retirement.