Since you're updating the styles anyway, might as well use the class styles from IA. It's content everyone can do so if they like the style a lot while in character creator, they can go farm it.
Yes, this seems like such a missed opportunity! They're already tailored to the class fantasy and have the class icon. Using a mishmash of styles per class to get back to a class fantasy feels so odd when the cohesive class set style is available.
The styles they chose seem to match the class archetypes pretty well, and I think most are better. I don't think the sorc style from the Archive looks as good as what they chose on PTS, for example.