While I definitely see the appeal in a “training ground” style aid during class change, I honestly feel there are too many variables involved in actually playing a class to give players a legitimate sense of what it will be like to play that class in different scenarios, with different equipment, at different levels, etc.
I think a healthy combination of “training ground/skill preview” AND circle resets would be ideal. That way, you can see what the class will be like prior to investing all that time into it to get a sort of sense of it. If you play it and end up deciding that, in the greater, overall context of ToS, you actually do not enjoy it as you thought you would, the reset would be a backup plan to encourage finding a path you like more.
This statement I definitely don’t agree with, though–if I am interested in a C3 skill for a class, but have to get to C2, ready to change to C3, before I get an opportunity to try it out, only to find that it is entirely underwhelming and terrible? It basically defeats the purpose of the training ground, in my opinion.

