It’s just my humble opinion but with the initial impression this other detailer left with his client, I would have doubts about his competence in general (including the proper use/application of products, prep, etc.).
Having said that, I will agree (at least I noticed) that OC lacked something when I applied it to my wife's gold metallic Forester (our DD). However, that's far from me saying that the finish was devoid of any gloss or that it necessarily diminishes the overall appearance of the finish. ….it just doesn't seem to add anything extra. On the other hand, some of the results I have seen from others (including some of the ones Scott has shared) I would be quite happy in regard to how OC looks.
I will agree that for those who are still planning to correct their vehicles every year or so, a more aesthetically pleasing semi-perm coating (or even a sealant/wax) might be a better choice. While OC may be permanent (and perhaps even harder than the OEM finish), we all know it is not impervious to scratches. I can see a day that I will need to correct my wife’s Forester again (if she decides to keep it). It was a bit of a struggle for me to decide whether I even wanted to use OC on her car. My final decision to do so was partly based on the realization that my priorities were going to change soon and I may not have the time nor the will (beyond cleaning/upkeep) to maintain the same level of attention to her finish I once could. Later discussions regarding reapplication of OC on existing layers (without complete removal) helped quell some of my other concerns regarding touch-ups. After nearly two years, I am quite happy with OC’s performance. ….and it will likely be another year or more before I even entertain the idea of another full correction/detail on that car. In all honesty, she will probably trade it in before I ever polish it again.
….my black Challenger (weekend car) is another story. I currently have DGPS on it (free sample that’s lasted me a couple of years) but have been looking at other products including 22PLE (I have no interest in using OC on it). I haven’t corrected it in over two years but will soon. My wife’s gold color is very forgiving. ….my black car is not.
Anyhow, if there's one thing I learned over the years on these forums is that user experiences can vary when it comes to the different products, tools and techniques that are discussed around here.