Also, regarding the edging in ③, as the angulation deepens, the outside ski gets more angle and the turn radius becomes shorter.
When the counter-rotation becomes stronger, the turn radius becomes longer, meaning the time spent edging increases. If you use a crossover here, the engagement becomes quicker, but with a cross-under, vertical movement becomes insufficient and the release becomes inadequate. This comparison video explaining with Kristoffersen and Meillard is easy to understand.
Only Shun Okumura was able to do it in the Technical Championships, but it seems difficult to do it in poles.