Sasha (and several American women known for their spirals) just scrape on by. Sasha was trained to be a multidirectional skater to compensate for her weak skating skills but she barely traces on the ice. Skaters are expect to be able to skating in many directions but the tracing is important.
Sasha does not scrape on by in her Spirals.
Moreover, pressing really hard into the ice is not a sure sign of skating skills.
Lilting edges require skill as well. Being able to flow over the ice and caress the ice without making deep tracings displays a certain ability (which isn't to say Sasha always displayed that quality).
Sasha executed her Charlotte on her flat. She did her vertical split skid spiral on her flat.
#1 - You are supposed to execute the Charlotte on a flat if you want to go in a
straight line.
#2 - You know what a skid is, right? You are always going to be on your flat (at least at some point) when you skid onto another edge.
Sasha displayed great control when doing these moves. Her blade remained steady when doing them.
Again, I would love to see how secure Rochette is when attempting the same positions. The more difficult the position, the harder it is to maintain balance.
You are definitely overstating the ability Rochette has. Her edges aren't THAT great when doing the Spiral and she doesn't execute the change-of-edge completely smooth either.
Also -
regarding Spirals in general - great edge control doesn't matter much if the position looks horrible. You can demonstrate deep, secure edges (in the same pattern as a Spiral) by simply stroking along the ice and/or holding an edge. A Spiral creates an image on the ice and if the skater's body doesn't look good then it is a fruitless endeavor.
Spirals are in a pretty horrible state these days. Almost every skater does the same forward change-of-edge spiral and jerks their body into a catch-blade position, usually looking like they are straining themselves and not enjoying it at all.
Joannie is no different in that regard. She displays better control and ice coverage than some skaters, but she still transfers awkwardly between positions when doing the catch-blade and looks like she is in pain and trying way too hard.