The post is for the sole benefit of those looking at Highway as a case study. Highway, I'm pretty sure you're not interested in critique or advice, as you seem to be satisfied with your skiing already, so I'm won't be addressing my comments directly to you. No rudeness is intended by that, and if I'm wrong in my interpretation of your mind-set, by all means let me know and feel free to use to your benefit the info I'm about to present.
While Heluva's bed side manner may be somewhat lacking in his post, the technical points he addresses are pretty dang accurate. I'll speak to the video of Highway carving on the groomer, for as Heluva says, this is where the foundation technical deficiencies really make themselves known.
If you closely observe the video you will see some pretty consistent technical flaws, and they originate from a couple key elements. The first is a tendency to excessively scissor his skis through the body of the turn, and to get too much lateral separation in his stance. This gets his inside foot well ahead of him as he comes out of the falline, and causes him to fall onto his inside ski as the hill falls away at the end of the turn.
If Highway were not as athletic as he is, this end of the turn fall to the inside would leave him in the precarious position of trying to go into the coming turn far on the tail of his forward scissored inside ski, and with his unweighted outside ski tracking away from him. But that doesn't happen to Highway because he's learned how to compensate for his technical flaw.
What Highway does to keep from going into the new turn sitting deep in the toilet is to make an aggressive up and forward extension at the last moment before losing his outside ski. This recovery move is the origin of the pogo stick transition you see him make after each turn. The move serves to launch him up into the air and forward, getting him back over his skis for the start of the new turn.
But it's during that forward recovery launch that the second flaw appears. While he's light he lets his tails drift out and redirects his skis toward the falline before finally applying a harsh edge engagement. This is made clearly evident, even to the untrained eye, by the first sign of snow spray coming off the skis not appearing until he's almost into the falline.
This is a pivot entry transition. No arc to arc skiing occurs. And once edge engagement does finally take place, the ensuing carve is inconsistent and occasionally steery. Then, while in the turn body, he again scissors his skis, gets too much stance separation, and the entire technically flawed cycle repeats.
The repair would be to narrow up the stance and square up the feet through the body of the turn, which would keep him balanced on his outside ski all the way through the arc, put him balanced position when he transfers pressure to the old inside ski, and thus eliminate the need for the recovery up move through the transition. Then, with the up move discarded, he could start to focus on subtly rolling the skis onto a clean edge, with no preliminary pivot, and experience for the first time a true arc to arc turn.
Highway described Heluva's skiing as "boring". In comparison to his own it certainly is. Highway's skiing is a conglomeration of athletic, energy intensive, movement excessive, linked recovery skiing,,,, where Heluva's is balanced, efficient, energy and movement conservative skiing.