I would like to open the thread with a clap to SE for their expansion. /clap /happy
Now, let's get down to business. Tanking and healing newbies. A lot of people would expect a rush of both the classes, come Heavensward (Dark Knight and Astrologian). They don't only have cool looking weapons but they are also a new experience.
The issue I predict is that some players will have difficulty in their roles. Some will just blindly go to dungeons and spam the first combo or healing spells and not experiment around. Also, some others are new to the roles and cannot take up such a complex class in such a manner (a 50 DPS taking up lvl 1 DRK, and expecting the same simplicity).
Therefore, I would like to suggest a "training dungeon" similar to the one of the GLD class quest where you have to take agro off your ally or he'll die and fail the duty. Similarly, I would also like to suggest a "training grounds" for healers, where he has to heal mutliple targets efficiently and effectively.
These training grounds, or "Practice area", should not give you any rewards or cost anything.
I think this would prove useful for beginners to the roles and veterans alike.