I realize you're saying not "generally" needed, but I immediately thought of the champion bandits in Kryta zones and the champions that spawn from awakened incursions. I'd also argue that teaching people about breakbars and cc as early as possible would be better for the state of the game as a whole. There are people at lvl 80 who dont know what breakbars or cc are. If you expect people to migrate from open world to instanced content, you need to teach them the mechanics of instanced content in open world, or they'll get frustrated and quit.
I absolutely, 100% agree that break bars should be better taught, or even taught at all. I will never argue to the contrary. However I also think we should be very careful about how many things like that we should be throwing at new players and I do not think this is required for level 1-10 content.