So... Your basing your calls on the very basic knowledge we have now? You can't possibly even see how SE could implement these spells in a way that doesn't encroach on other roles?

You lack imagination, and faith in development team.

As for flexibility, like I said: It's limited to the competency of the devs. If they release a load of situational skills and spells, then yes it won't be flexible.

And again, through your logic there is absolutely no reason to add RDM. If you don't want any other roles blurred, you backed the wrong horse.

Simply having the armory system blurs most of the roles in this game.